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Financial Instruments, Hedging Activities and Fair Value Measurements - Accumulated Other Comprehensive (Loss) Income (Details) - Fair Value, Inputs, Level 2 [Member] - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total AOCI $ 5.9 $ (28.1)
Cash Flow Hedging [Member] | Interest Rate Cap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total AOCI 4.3 (3.4)
Cash Flow Hedging [Member] | Interest Rate Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total AOCI 34.9 3.0
Net Investment Hedging [Member] | Currency Swap [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total AOCI $ (33.3) $ (27.7)