Quarterly report pursuant to Section 13 or 15(d)

Credit facilities (Details)

v3.2.0.727
Credit facilities (Details)
CAD in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2015
CAD
item
Jun. 30, 2015
USD ($)
item
Apr. 01, 2015
USD ($)
Mar. 09, 2015
USD ($)
Maximum          
Credit Facilities          
Derivative Liability     $ 0.1    
Credit Agreement Expiring January 2020          
Credit Facilities          
Maximum borrowing capacity         $ 400.0
Amount borrowed       $ 225.0  
Number of letters of credit issued | item   4 4    
Fixed payment of principal balance     $ 66.7    
Interest Paid $ 0.5        
Credit Agreement Expiring January 2020 | U.S Dollar Borrowings          
Credit Facilities          
Amount borrowed     155.0    
Credit Agreement Expiring January 2020 | Canadian Dollar Borrowings          
Credit Facilities          
Amount borrowed   CAD 13.5 11.0    
Credit Agreement Expiring January 2020 | Minimum          
Credit Facilities          
Leverage ratio to calculate annual commitment fee (as a percent)   0.15%      
Credit Agreement Expiring January 2020 | Minimum | Base Rate          
Credit Facilities          
Margin (as a percent)   0.00%      
Credit Agreement Expiring January 2020 | Minimum | Eurocurrency Rate          
Credit Facilities          
Margin (as a percent)   1.00%      
Credit Agreement Expiring January 2020 | Minimum | Index Rate          
Credit Facilities          
Margin (as a percent)   1.00%      
Credit Agreement Expiring January 2020 | Maximum          
Credit Facilities          
Leverage ratio   2.5      
Total leverage ratio   1.0      
Leverage ratio to calculate annual commitment fee (as a percent)   0.30%      
Credit Agreement Expiring January 2020 | Maximum | Base Rate          
Credit Facilities          
Margin (as a percent)   0.75%      
Credit Agreement Expiring January 2020 | Maximum | Eurocurrency Rate          
Credit Facilities          
Margin (as a percent)   1.75%      
Credit Agreement Expiring January 2020 | Maximum | Index Rate          
Credit Facilities          
Margin (as a percent)   1.75%      
Swingline loans          
Credit Facilities          
Maximum borrowing capacity         5.0
Letters of credit          
Credit Facilities          
Maximum borrowing capacity         $ 30.0
Outstanding borrowings     1.4    
Letters of credit (Other than Revolving Credit Agreement)          
Credit Facilities          
Outstanding borrowings     $ 3.0    
Number of letters of credit issued | item   2 2    
Atlantic Innovation Fund of Canada          
Credit Facilities          
Outstanding borrowings   CAD 1.2 $ 1.0