Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

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Nominal or face amount used to calculate payment on derivative.

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Period remaining until the derivative contract matures, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Derivative Instruments (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Asset			$ 5.4
Net assets associated with foreign currency derivatives	$ (12.6)		$ 5.4
Maturity period of derivatives (in months)	18 months
Estimated amount of net gains (losses) associated with derivative instruments, net of tax, in next twelve months	$ (7.9)
Designated as Hedging Instrument \| Foreign Exchange Forward \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	206.4
Designated as Hedging Instrument \| United Kingdom, Pounds \| Foreign Exchange Forward \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	119.8
Designated as Hedging Instrument \| Australia, Dollars \| Foreign Exchange Forward \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	55.7
Designated as Hedging Instrument \| Euro Member Countries, Euro \| Foreign Exchange Forward \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	13.5
Designated as Hedging Instrument \| Brazil, Brazil Real \| Foreign Exchange Forward \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	3.4
Designated as Hedging Instrument \| Singapore, Dollars \| Foreign Exchange Forward \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	5.6
Designated as Hedging Instrument \| Norway, Krone \| Foreign Exchange Forward \| Cash Flow Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	8.4
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) on derivatives not designated as hedging instruments	(0.1)	$ (3.1)
Not Designated as Hedging Instrument \| Foreign Exchange Forward \| Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	65.0
Not Designated as Hedging Instrument \| United Kingdom, Pounds \| Foreign Exchange Forward \| Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	20.7
Not Designated as Hedging Instrument \| Nigeria, Nairas \| Foreign Exchange Forward \| Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	5.5
Not Designated as Hedging Instrument \| Thailand, Baht \| Foreign Exchange Forward \| Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	5.4
Not Designated as Hedging Instrument \| Norway, Krone \| Foreign Exchange Forward \| Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	8.3
Not Designated as Hedging Instrument \| No currency \| Foreign Exchange Forward \| Fair Value Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Notional Amount	$ 3.3