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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
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This element represents the amount of any change recognized during the period in the high-end of the estimated range of outcomes (undiscounted) of a liability assumed in a business combination arising from an item of contingent consideration.

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For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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

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Average fixed interest rate related to the group of interest rate derivatives.

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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, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Nominal or face amount used to calculate payments on a nonderivative instrument.

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Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Mar. 31, 2018	Feb. 28, 2018	Feb. 14, 2018	Dec. 31, 2017
Derivatives Fair Value
Contingent acquisition consideration liabilities	$ 44,600,000					$ 7,500,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swap
Derivatives Fair Value
Derivative, average fixed interest rate	2.4418%
Notional amounts of the forward contracts	$ 800,000,000
Senior Secured Notes, maturing 2025
Derivatives Fair Value
Debt Instrument, interest rate, stated percentage				2.946%
Senior Secured Notes, maturing 2025 \| Senior Notes
Derivatives Fair Value
Debt Instrument, interest rate, stated percentage	5.00%			2.946%
Senior Secured Notes, maturing 2025 \| Senior Notes \| Cross-currency interest rate swaps
Derivatives Fair Value
Debt converted in interest rate swap				$ 460,000,000
Senior Secured Euro Notes, maturing 2026
Derivatives Fair Value
Debt Instrument, interest rate, stated percentage					3.375%
Senior Secured Euro Notes, maturing 2026 \| Net Investment Hedging \| Designated as Hedging Instrument
Derivatives Fair Value
Net investment non-derivative hedge	$ 155,000,000
Senior Secured Euro Notes, maturing 2026 \| Senior Notes
Derivatives Fair Value
Debt Instrument, interest rate, stated percentage	3.375%
Earnings Based Metrics
Derivatives Fair Value
Maximum contingent consideration payout	$ 49,200,000.0
Level 3 \| Earnings Based Metrics
Derivatives Fair Value
Increases to calculated fair value of contingent acquisition consideration	2,300,000	$ 8,400,000	$ 18,000,000
Accrued Liabilities
Derivatives Fair Value
Contingent acquisition consideration liabilities	$ 22,100,000