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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Value of input used to measure alternative investment.

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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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For contingent consideration arrangements and indemnification assets recognized in connection with a business combination, this element represents an estimate of the low-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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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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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 number of derivative instruments of a particular group held by the entity.

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

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Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

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Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets.

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No definition available.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Fair value of financial instruments Fair value of financial instruments (Details)	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 18, 2017 USD ($)	Mar. 31, 2016 derivative_instrument
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Debt Instrument [Line Items]
Notional value	$ 153,400,000.0	$ 153,400,000.0
Weighted average maturity		2 months
Designated as Hedging Instrument \| Interest Rate Swap
Debt Instrument [Line Items]
Notional value	40,000,000	$ 40,000,000
Weighted average maturity		1 year 3 months 15 days
Number of interest rate swaps \| derivative_instrument					2
Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Instrument [Line Items]
Fair Value of swap, net	1,600,000	$ 1,600,000
Prepaid Expenses and Other Current Assets \| Not Designated as Hedging Instrument \| Foreign Exchange Contract \| Level 2
Debt Instrument [Line Items]
Fair value of foreign currency contract, net	1,400,000	1,400,000
Prepaid Expenses and Other Current Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Instrument [Line Items]
Fair value of swap, asset position	600,000	600,000
Other Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Instrument [Line Items]
Fair value of swap, asset position	1,000,000	1,000,000
Six hundred million senior unsecured notes
Debt Instrument [Line Items]
Carrying value	600,000,000	600,000,000	$ 600,000,000
Six hundred million senior unsecured notes \| Level 3
Debt Instrument [Line Items]
Fair value	$ 552,400,000	552,400,000	$ 590,600,000
Maco
Debt Instrument [Line Items]
Scheduled installments period	1 year 3 months
Potential undiscounted amount minimum				$ 0
Potential undiscounted amount maximum	$ 30,300,000	30,300,000		30,300,000.0
Contingent consideration				$ 28,700,000
Maco \| Level 3
Debt Instrument [Line Items]
Contingent consideration	29,700,000	29,700,000
Maco \| Accrued Liabilities \| Level 3
Debt Instrument [Line Items]
Contingent consideration	15,100,000	15,100,000
Maco \| Other Noncurrent Liabilities \| Level 3
Debt Instrument [Line Items]
Contingent consideration	$ 14,600,000	$ 14,600,000
Measurement Input, Revenue Multiple \| Maco
Debt Instrument [Line Items]
Revenue multiple				2.5