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Long-Term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2014
Jan. 31, 2016
May. 19, 2015
Jan. 31, 2015
Debt Instrument [Line Items]        
Long term debt outstanding   $ 1,200.0    
Revolving Credit Facility        
Debt Instrument [Line Items]        
Amount outstanding   0.0   $ 0.0
Revolving credit facility     $ 750.0  
Amounts outstanding under the Revolving Credit Facility   0.0   0.0
Long term debt outstanding   1,200.0    
Outstanding letter of credit amount   3.3    
Senior Unsecured Notes 5.875 Percent Due 2022        
Debt Instrument [Line Items]        
Senior unsecured notes $ 1,200.0 1,200.0   1,200.0
Less unamortized original issue discount and debt issue costs   20.5   22.8
Senior unsecured notes net of unamortized original issue discount and debt issue costs   $ 1,179.5   $ 1,177.2
Debt, interest rate   5.875%    
Proceeds from the issue of Notes 1,172.1      
Amount distributed to former parent from the proceeds 750.0      
Proceeds net of distribution to former parent $ 422.1