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Debt and Credit Facilities - Recent Activity (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Mar. 25, 2017
Jul. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Term Loan A due July 2019        
Extinguishment of Debt [Line Items]        
Prepayment of term loan due July 2019 $ 755.2 $ 96.3 $ 96.3  
Remaining balance, credit facility     $ 222.2 $ 818.3
Term Loan A Facility due July 2017        
Extinguishment of Debt [Line Items]        
Repayment of term loan A due July 2017   $ 250.0