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

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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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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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No definition available.

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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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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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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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Debt (bills, notes or bonds) that are issued by the government of the United States which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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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 (Details)		12 Months Ended
Fair Value of Financial Instruments (Details)	Jul. 18, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Mar. 31, 2016 derivative_instrument
Investments in Available-for-sale Securities [Line Items]
Weighted average maturity		1 month
Senior unsecured notes
Investments in Available-for-sale Securities [Line Items]
Carrying value		$ 0	$ 85,700,000
Fair value		0	88,200,000
Not Designated as Hedging Instrument \| Foreign Exchange Contract
Investments in Available-for-sale Securities [Line Items]
Notional value		145,500,000.0
Designated as Hedging Instrument \| Currency Swap
Investments in Available-for-sale Securities [Line Items]
Notional value		$ 1,600,000.0
Weighted average maturity		1 month
Designated as Hedging Instrument \| Interest Rate Swap
Investments in Available-for-sale Securities [Line Items]
Notional value		$ 40,000,000
Weighted average maturity		1 year 8 months 15 days
Number of swaps \| derivative_instrument				2
Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Investments in Available-for-sale Securities [Line Items]
Fair value of swap, net		$ 1,000,000
Prepaid Expenses and Other Current Assets \| Designated as Hedging Instrument \| Currency Swap \| Level 2
Investments in Available-for-sale Securities [Line Items]
Fair value of contract		600,000
Prepaid Expenses and Other Current Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Investments in Available-for-sale Securities [Line Items]
Fair value of swap, asset position		200,000
Other Assets \| Designated as Hedging Instrument \| Interest Rate Swap \| Level 2
Investments in Available-for-sale Securities [Line Items]
Fair value of swap, asset position		800,000
Six hundred million senior unsecured notes
Investments in Available-for-sale Securities [Line Items]
Fair value		590,600,000	0
Unsecured Debt		600,000,000	$ 0
Maco
Investments in Available-for-sale Securities [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
Investments in Available-for-sale Securities [Line Items]
Contingent consideration		29,100,000
Maco \| Accrued Liabilities \| Level 3
Investments in Available-for-sale Securities [Line Items]
Contingent consideration		14,800,000
Maco \| Other Noncurrent Liabilities \| Level 3
Investments in Available-for-sale Securities [Line Items]
Contingent consideration		$ 14,300,000