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Long-Term Debt (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2016
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2011
Debt Instrument [Line Items]        
Long-term debt     $ 1,174.3 $ 1,180.2
Line of credit facility, standby letters of credit issued against the facility     24.9  
Long-term debt, weighted average interest rate     8.10% 8.00%
Line of Credit [Member]
       
Debt Instrument [Line Items]        
Long-term debt     0 0
Line of credit facility, maximum borrowing capacity 235.0 86.8    
Line of credit facility, remaining borrowing capacity     296.9  
Secured Debt [Member]
       
Debt Instrument [Line Items]        
Long-term debt     379.3 379.0
Unsecured Debt [Member] | 2014 Notes [Member]
       
Debt Instrument [Line Items]        
Long-term debt     249.9 249.9
Unsecured Debt [Member] | 2017 Notes [Member]
       
Debt Instrument [Line Items]        
Long-term debt     300.0 300.0
Unsecured Debt [Member] | 2019 Notes [Member]
       
Debt Instrument [Line Items]        
Long-term debt     200.0 200.0
Foreign Credit Facilities [Member]
       
Debt Instrument [Line Items]        
Long-term debt     39.3 45.2
Line of credit facility, remaining borrowing capacity     32.6  
Capital Lease Obligations [Member]
       
Debt Instrument [Line Items]        
Long-term debt     $ 5.8 $ 6.1