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Debt Including Capital Lease Obligations - Long-term Debt Including Capital Lease Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Line of Credit Facility    
Long-term debt, gross $ 481.2 $ 491.9
Less: debt issuance costs (2.7) (3.1)
Total debt including capital lease obligations, net of debt issuance costs 478.5 488.8
Less: debt maturing within one year 15.0 7.5
Long-term debt including capital lease obligations $ 463.5 481.3
Revolving Credit Facility    
Line of Credit Facility    
Interest Rate 2.23%  
Long-term debt, gross $ 101.2 111.9
Term Loan    
Line of Credit Facility    
Interest Rate 2.59%  
Long-term debt, gross $ 300.0 300.0
Capital lease obligations    
Line of Credit Facility    
Interest Rate 7.67%  
Long-term debt, gross $ 80.0 $ 80.0