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Fair Value Measurements and Risk - Gain (Loss) on Derivative Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Gains and losses on derivative instruments        
Interest and Debt Expense $ (19.6) $ (19.9) $ (39.6) $ (39.2)
Nonoperating Income (Expense) (0.1) (5.9) 2.1 (2.6)
Cash Flow Hedging        
Gains and losses on derivative instruments        
Amount of Gain (Loss) Recognized in OCI on Derivatives (10.2) 32.1 (1.2) 27.0
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (3.1) 42.7 10.2 36.4
Cash Flow Hedging | Interest rate derivatives        
Gains and losses on derivative instruments        
Amount of Gain (Loss) Recognized in OCI on Derivatives (1.8) 0.3 (2.9) 1.8
Cash Flow Hedging | Interest rate derivatives | Interest expense        
Gains and losses on derivative instruments        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0.0 0.1 0.0 (0.1)
Cash Flow Hedging | Currency contracts        
Gains and losses on derivative instruments        
Gain (Loss) from Components Excluded from Assessment of Cash Flow Hedge Effectiveness, Net 0.7 0.4 1.4 (0.4)
Amount of Gain (Loss) Recognized in OCI on Derivatives (0.8) 10.4 0.8 3.8
Cash Flow Hedging | Currency contracts | Other expense        
Gains and losses on derivative instruments        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (1.3) 10.2 0.0 4.1
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 0.0 0.3 0.0 1.1
Cash Flow Hedging | Variable-to-fixed cross-currency swaps | Interest expense        
Gains and losses on derivative instruments        
Amount of Gain (Loss) Recognized in OCI on Derivatives (2.2) 3.1 (2.1) 3.1
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 3.6 3.1 7.2 3.1
Cash Flow Hedging | Variable-to-fixed cross-currency swaps | Other expense        
Gains and losses on derivative instruments        
Amount of Gain (Loss) Recognized in OCI on Derivatives (5.4) 18.3 3.0 18.3
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (5.4) 29.3 3.0 29.3
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 $ (1.3) $ 0.1 $ (2.7)