Long-Term debt (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term debt $ 2,154.7  
Less current portion of long-term debt 16.1 16.2
Long-term debt, net of current maturities 2,138.6 2,142.7
Term Loan Facility    
Debt Instrument [Line Items]    
Outstanding long-term debt net 2,172.5  
Outstanding long-term debt 2,194.5  
Outstanding long-term debt, current $ 22.0