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Long-Term Debt - Schedule of Long-Term Debt Instruments (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 1,598.2 $ 0
Weighted average cost of debt 4.20% 0.00%
Secured Debt | Term loan, due 2021
   
Debt Instrument [Line Items]    
Long-term debt 798.2 0
Senior Notes
   
Debt Instrument [Line Items]    
Long-term debt 800.0 0
Senior Notes | 5.250% senior unsecured notes, due 2022
   
Debt Instrument [Line Items]    
Long-term debt 400.0 0
Senior Notes | 5.625% senior unsecured notes, due 2024
   
Debt Instrument [Line Items]    
Long-term debt $ 400.0 $ 0