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Debt (Details)
$ in Millions
12 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Feb. 26, 2013
USD ($)
Revolving Credit Agreement        
Debt discount     $ 0.4  
Debt issuance costs     2.6  
Senior unsecured notes, 4.45% due March 2023 (face value of $300.0 million at June 30, 2015 and 2014)        
Revolving Credit Agreement        
Face amount $ 300.0 $ 300.0   $ 300.0
Interest rate 4.45% 4.45%   4.45%
Credit Agreement        
Revolving Credit Agreement        
Debt issuance costs     $ 0.8  
Maximum borrowing capacity $ 500.0      
Letters of credit issued 7.1      
Credit Agreement available for future borrowings $ 492.9      
Credit Agreement | LIBOR        
Revolving Credit Agreement        
Variable rate basis LIBOR      
Interest rate margin (as a percent) 1.25%      
Credit Agreement | LIBOR | Minimum        
Revolving Credit Agreement        
Interest rate margin (as a percent) 0.75%      
Credit Agreement | LIBOR | Maximum        
Revolving Credit Agreement        
Interest rate margin (as a percent) 1.90%      
Credit Agreement | Base Rate        
Revolving Credit Agreement        
Variable rate basis Base Rate      
Interest rate margin (as a percent) 0.25%      
Credit Agreement | Base Rate | Minimum        
Revolving Credit Agreement        
Interest rate margin (as a percent) 0.00%      
Credit Agreement | Base Rate | Maximum        
Revolving Credit Agreement        
Interest rate margin (as a percent) 0.90%      
Letters of credit        
Revolving Credit Agreement        
Commitment fee rate (as a percent) 0.15%      
Letter of credit fees (as a percent) 1.25%      
Required interest coverage ratio 3.50      
Letters of credit | Minimum        
Revolving Credit Agreement        
Commitment fee rate (as a percent) 0.075%      
Letter of credit fees (as a percent) 0.75%      
Letters of credit | Maximum        
Revolving Credit Agreement        
Commitment fee rate (as a percent) 0.375%      
Letter of credit fees (as a percent) 1.90%      
Required debt to capital ratio 0.55