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Long-term Debt (Details) - USD ($)
$ in Millions
1 Months Ended
Aug. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Borrowings      
Unamortized discount and debt issuance costs   $ (3.8) $ (4.6)
Total long-term debt   596.2 745.4
Less current portion of long-term debt     (149.8)
Total long-term debt, net of current portion   $ 596.2 $ 595.6
3.75% senior notes due 2022      
Borrowings      
Interest rate (as a percent)   3.75% 3.75%
Long-term debt, carrying amount   $ 350.0 $ 350.0
3.75% senior notes due 2022 | Significant Observable Inputs (Level 2)      
Borrowings      
Fair value of notes   $ 360.7 $ 349.3
5.125% senior notes due 2020      
Borrowings      
Interest rate (as a percent)   5.125% 5.125%
Long-term debt, carrying amount   $ 250.0 $ 250.0
5.125% senior notes due 2020 | Significant Observable Inputs (Level 2)      
Borrowings      
Fair value of notes   272.0 $ 268.6
6.125% senior notes due 2016      
Borrowings      
Interest rate (as a percent)     6.125%
Long-term debt, carrying amount     $ 150.0
Repayment of debt $ 150.0    
6.125% senior notes due 2016 | Significant Observable Inputs (Level 2)      
Borrowings      
Fair value of notes     152.9
Revolving credit facility      
Borrowings      
Maximum borrowing capacity   600.0  
Amount outstanding   $ 0.0 $ 0.0