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
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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.

+ References

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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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- Definition

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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-Publisher FASB
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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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No definition available.

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- Definition

Market valuation of entity divided by revenue, used as an input to measure fair value.

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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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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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- Definition

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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No definition available.

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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
	Jul. 18, 2017 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2016 derivative_instrument
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Debt Instrument [Line Items]
Notional value		$ 170,500,000.0
Weighted average maturity		1 month
Designated as Hedging Instrument \| Interest Rate Swap
Debt Instrument [Line Items]
Notional value		$ 40,000,000
Weighted average maturity		1 year 6 months 18 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		$ 1,400,000
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		300,000
Other Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Debt Instrument [Line Items]
Fair value of swap, asset position		1,100,000
Six hundred million senior unsecured notes
Debt Instrument [Line Items]
Carrying value		600,000,000	$ 600,000,000
Six hundred million senior unsecured notes \| Level 3
Debt Instrument [Line Items]
Fair value		558,900,000	$ 590,600,000
Maco
Debt Instrument [Line Items]
Scheduled installments period	2 years
Potential undiscounted amount minimum	$ 0
Potential undiscounted amount maximum	$ 30,300,000.0	30,300,000
Revenue multiple	2.5
Contingent consideration	$ 28,700,000
Maco \| Level 3
Debt Instrument [Line Items]
Contingent consideration		29,300,000
Maco \| Accrued Liabilities \| Level 3
Debt Instrument [Line Items]
Contingent consideration		14,900,000
Maco \| Other Noncurrent Liabilities \| Level 3
Debt Instrument [Line Items]
Contingent consideration		$ 14,400,000