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Derivative Financial Instruments - Effect on Statement of Comprehensive Income and Statement of Income (Details) - Designated as Hedging Instrument - Derivatives in Net Investment Hedging Relationship - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Gain (Loss) Recorded in Other Comprehensive Income $ (11.4) $ 1.0
Gain Reclassified from Accumulated Other Comprehensive Income into Earnings 0.5 (0.1)
Gain Recorded in Earnings from Excluded Components [1] 13.9 3.8
Forward contracts    
Derivative [Line Items]    
Gain (Loss) Recorded in Other Comprehensive Income (21.7) 27.2
Gain Reclassified from Accumulated Other Comprehensive Income into Earnings 0.5 (0.1)
Gain Recorded in Earnings from Excluded Components [1] 13.9 3.8
Put options    
Derivative [Line Items]    
Gain (Loss) Recorded in Other Comprehensive Income 29.3 (17.8)
Gain Reclassified from Accumulated Other Comprehensive Income into Earnings 0.0 0.0
Gain Recorded in Earnings from Excluded Components [1] 0.0 0.0
Call options    
Derivative [Line Items]    
Gain (Loss) Recorded in Other Comprehensive Income (19.0) (8.4)
Gain Reclassified from Accumulated Other Comprehensive Income into Earnings 0.0 0.0
Gain Recorded in Earnings from Excluded Components [1] $ 0.0 $ 0.0
[1] The excluded components of the forward contracts are recorded in earnings on a straight-line basis over the respective period of the contracts as a reduction to Interest expense.