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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-Article 12
-Section 13
-Sentence Column B

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- Definition

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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- Definition

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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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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- Definition

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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No definition available.

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Fair Value Measurements - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended
	Feb. 28, 2018	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Amount expected to be reclassified during next 12 months			$ 0
Contingent consideration			$ 25,500,000	$ 7,500,000
Earnings Based Metrics
Derivative [Line Items]
Maximum contingent consideration				$ 38,500,000.0
Level 3 \| Earnings Based Metrics
Derivative [Line Items]
Increase in fair value of contingent consideration		$ 18,000,000
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest rate swap
Derivative [Line Items]
Derivative average fixed interest rate			2.4418%
Total notional amount of swaps			$ 800,000,000
Senior Secured Notes, Maturing 2025
Derivative [Line Items]
Debt interest rate	2.946%
Senior Secured Notes, Maturing 2025 \| Senior Notes
Derivative [Line Items]
Debt interest rate	2.946%		5.00%
Senior Secured Notes, Maturing 2025 \| Senior Notes \| Cross-currency interest rate swaps
Derivative [Line Items]
Long-term debt	$ 460,000,000
Senior Secured Euro Notes, Maturing 2026 \| Net Investment Hedging \| Designated as Hedging Instrument
Derivative [Line Items]
Designated as net investment non-derivative hedge	$ 125,000,000
Senior Secured Euro Notes, Maturing 2026 \| Senior Notes
Derivative [Line Items]
Debt interest rate			3.375%