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Derivative Instruments - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional amount	$ 946.9	$ 656.4
Foreign exchange contracts \| Cost of revenues and operating expenses
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified	(3.8)
Changes in fair value of non-designated derivatives	3.6	7.6	$ 1.8
Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Derivative instruments, gain (loss) recognized in other comprehensive income (loss), Effective portion	(6.3)
Derivative instruments, gain (loss) recognized in other comprehensive income (loss), Effective portion		(8.7)	20.2
Cash flow hedges \| Foreign exchange contracts \| Cost of revenues and operating expenses
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified		0.9	$ 7.6
Designated as hedge
Derivatives, Fair Value [Line Items]
Notional amount	$ 784.0	497.7
Designated as hedge \| Cash flow hedges
Derivatives, Fair Value [Line Items]
Maturities of derivatives	24 months
Losses expected to be reclassified into earnings within the next 12 months	$ 4.4
Designated as hedge \| Cash flow hedges \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional amount	484.0	497.7
Non-designated derivatives
Derivatives, Fair Value [Line Items]
Notional amount	$ 162.9	$ 158.7
Minimum \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Maturities of derivatives	1 month
Maximum \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Maturities of derivatives	4 months