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Debt and Credit Facilities - Credit Facility (Details) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
Mar. 25, 2017
Jul. 31, 2017
Dec. 31, 2017
Term Loan A Due July 2017      
Debt Instrument [Line Items]      
Repayment of Term Loan A facility due July 2017   $ 250.0  
Term Loan A Due July 2019      
Debt Instrument [Line Items]      
Prepayments of Term Loan A facility due in July 2019 $ 755.2   $ 96.3
Credit facility, remaining balance     $ 222.7