Financial Instruments, Risk Management and Fair Value Measurements - Derivatives Gain (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Derivatives Designated as Hedging Instruments
Unrealized hedging gains (losses) and other, net of tax		$ 27.5	$ 0.9
Reclassification of deferred hedging (gains) losses, net of tax	[1]	(10.3)	(3.6)
Total derivative instruments, net of tax of $9.2 and $(1.0) for the three months ended March 31, 2020 and 2019, respectively		17.2	(2.7)
Designated as Hedging Instrument
Derivatives Designated as Hedging Instruments
Unrealized hedging gains (losses) and other, net of tax		27.5	0.9
Reclassification of deferred hedging (gains) losses, net of tax		(10.3)	(3.6)
Total derivative instruments, net of tax of $9.2 and $(1.0) for the three months ended March 31, 2020 and 2019, respectively		17.2	(2.7)
Designated as Hedging Instrument | Foreign exchange contracts
Derivatives Designated as Hedging Instruments
Unrealized hedging gains (losses) and other, net of tax		29.7	6.9
Reclassification of deferred hedging (gains) losses, net of tax		(9.8)	(3.6)
Total derivative instruments, net of tax of $9.2 and $(1.0) for the three months ended March 31, 2020 and 2019, respectively		19.9	3.3
Designated as Hedging Instrument | Interest rate contracts
Derivatives Designated as Hedging Instruments
Unrealized hedging gains (losses) and other, net of tax		(2.2)	(6.0)
Reclassification of deferred hedging (gains) losses, net of tax		(0.5)	0.0
Total derivative instruments, net of tax of $9.2 and $(1.0) for the three months ended March 31, 2020 and 2019, respectively		(2.7)	(6.0)
Not Designated as Hedging Instrument
Derivatives Not Designated as Hedging Instruments
Amount of pre-tax gain or (loss) recognized in income on derivatives		11.0	(2.9)
Not Designated as Hedging Instrument | Foreign exchange contracts | Cost of sales and services
Derivatives Not Designated as Hedging Instruments
Amount of pre-tax gain or (loss) recognized in income on derivatives		$ 11.0	$ (2.9)

[1] For more detail on the components of these reclassifications and the affected line item in the condensed consolidated statements of income (loss) see Note 15.