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Fair Value Measurements and Risk - Gain (Loss) on Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Gains and losses on derivative instruments    
Interest and Debt Expense $ 20.0 $ 19.3
Nonoperating Income (Expense) 2.2 3.3
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net 0.0 (0.8)
Cash Flow Hedging    
Gains and losses on derivative instruments    
Amount of Gain (Loss) Recognized in OCI on Derivatives 9.0 (5.1)
Amount of Gain (Loss) Reclassified from OCI into Income 13.3 (6.3)
Cash Flow Hedging | Interest rate derivatives    
Gains and losses on derivative instruments    
Amount of Gain (Loss) Recognized in OCI on Derivatives (1.1) 1.5
Cash Flow Hedging | Interest rate derivatives | Interest expense    
Gains and losses on derivative instruments    
Amount of Gain (Loss) Reclassified from OCI into Income 0.0 (0.2)
Cash Flow Hedging | Currency contracts    
Gains and losses on derivative instruments    
Amount of Gain (Loss) Recognized in OCI on Derivatives 1.6 (6.6)
Cash Flow Hedging | Currency contracts | Other expense    
Gains and losses on derivative instruments    
Amount of Gain (Loss) Reclassified from OCI into Income 1.3 (6.1)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0.7 0.9
Cash Flow Hedging | Variable-to-fixed cross-currency derivatives | Interest expense    
Gains and losses on derivative instruments    
Amount of Gain (Loss) Recognized in OCI on Derivatives 0.1  
Amount of Gain (Loss) Reclassified from OCI into Income 3.6 0.0
Cash Flow Hedging | Variable-to-fixed cross-currency derivatives | Other expense    
Gains and losses on derivative instruments    
Amount of Gain (Loss) Recognized in OCI on Derivatives 8.4  
Amount of Gain (Loss) Reclassified from OCI into Income 8.4 0.0
Derivatives not designated as hedging instruments under ASC 815: | Currency contracts | Other expense    
Gains and losses on derivative instruments    
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net $ (0.1) $ (1.4)