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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($)	9 Months Ended
	Sep. 30, 2018	Aug. 01, 2018	Dec. 31, 2017	Nov. 06, 2017
Debt Instrument
Document Period End Date	Sep. 30, 2018
Total debt, net of unamortized discount and debt issuance costs	$ 510,200,000		$ 498,100,000
Less: current maturities	(9,700,000)		(58,900,000)
Long-term debt	500,500,000		439,200,000
Foreign facilities
Debt Instrument
Long term debt	9,700,000		7,900,000
Revolving Credit Facility | Senior secured revolving credit facility due November 2022
Debt Instrument
Unamortized debt issuance costs	(2,000,000)
Long term debt	298,500,000		239,000,000
Convertible Debt | Convertible Notes, due 2024
Debt Instrument
Principal amount	258,800,000		258,800,000	$ 258,800,000.0
Unamortized discount	(52,200,000)		(57,600,000)
Unamortized debt issuance costs	(4,600,000)		(5,100,000)
Convertible Debt	202,000,000		196,100,000
Convertible Debt | Convertible Notes, Due 2018
Debt Instrument
Principal amount	0	$ 57,100,000	57,100,000
Unamortized discount	0		(1,900,000)
Unamortized debt issuance costs	0		(100,000)
Convertible Debt	$ 0		55,100,000
Convertible debt, current			$ 55,100,000

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