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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Tender Offer

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of hedged item in hedging relationship. Excludes hedged asset or liability.

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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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- Definition

The carrying amount on the books of the entity of the impaired asset to be disposed of by a method other than sale.

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- Definition

Amount, after tax, of reclassification from accumulated other comprehensive income (AOCI) of gain (loss) from increase (decrease) in fair value of net investment hedge.

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Derivatives and Financial Instruments - Additional Information (Detail) $ in Millions	1 Months Ended	9 Months Ended	12 Months Ended
	Jun. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 EUR (€)	Sep. 30, 2015 EUR (€)
Derivative [Line Items]
Gain (Loss) on Derivative Used in Net Investment Hedge, after Tax		$ (6.1)	$ (29.6)
Impaired Assets to be Disposed of by Method Other than Sale, Carrying Value of Asset			10.8
Foreign Exchange Contract [Member]
Derivative [Line Items]
Notional amount		$ 361.6	$ 481.4
Senior Notes 2.45% Due 2019 \| Senior Notes
Derivative [Line Items]
Amount of hedged item \| €				€ 136,600,000.0	€ 500,000,000
Interest rate		2.45%		2.45%	2.45%
Tender Offer	$ 363.4