Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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-Publisher FASB
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The number of derivative instruments of a particular group held by the entity.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The increase (decrease) during the period in the net carrying value of derivative instruments reported as assets and liabilities that are due to be disposed of within one year (or the normal operating cycle, if longer).

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of income (expense) related to nonoperating activities, classified as other.

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Derivative Instruments and Hedging Activities (Details) € in Millions, £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 EUR (€)	Nov. 30, 2016 USD ($)	Apr. 29, 2016 USD ($)	Apr. 29, 2016 EUR (€)	Nov. 23, 2015 USD ($)	Nov. 23, 2015 EUR (€)
Derivative Instruments Gain Loss [Line Items]
Number of foreign currency option contracts									2	2
Derivative, Notional Amount									$ 1,547.1	€ 1,416.0
Interest expense	$ (117.3)	$ (101.4)	$ (32.5)
Gain (loss) recognized on non-designated derivative instruments:
Gain (loss) recognized on non-designated derivative instruments, total	2.0	8.5	13.5
Miscellaneous, net	8.8	3.5	3.7
Foreign exchange gain (loss), net	(3.9)	(2.1)	(10.0)
Increase (Decrease) in Derivative Assets and Liabilities	$ 9.3
Currency Forward Agreements EUR to USD [Member]
Derivative Instruments Gain Loss [Line Items]
Number of foreign currency option contracts	10			10	10
Derivative, Notional Amount	$ 56.8				€ 49.6
Interest Rate Swap
Derivative Instruments Gain Loss [Line Items]
Derivative, Notional Amount						$ 400.0
Interest expense	(4.3)	(5.1)	(4.2)
Foreign Exchange Option [Member]
Gain (loss) recognized on non-designated derivative instruments:
Miscellaneous, net	0.0	35.6	7.0
Increase (Decrease) in Derivative Assets and Liabilities		35.6	7.0
Foreign Exchange Forward and Cash Flow Hedges [Member]
Derivative Instruments Gain Loss [Line Items]
Number of foreign currency option contracts							1	1
Derivative, Notional Amount							$ 820.9	€ 713.0
Gain (loss) recognized on non-designated derivative instruments:
Miscellaneous, net		(26.4)	0.0
Foreign exchange gain (loss), net	6.3	4.4	$ 10.7
Increase (Decrease) in Derivative Assets and Liabilities	$ 0.0	$ 26.4
Currency Forward Agreements EUR to GBP [Member]
Derivative Instruments Gain Loss [Line Items]
Number of foreign currency option contracts	12			12	12
Derivative, Notional Amount				£ 31.0	€ 35.0