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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Nov. 06, 2017
Debt Instrument
Total debt, net of unamortized discount and debt issuance costs	$ 309,200,000	$ 544,400,000
Less: current maturities	(4,500,000)	(11,200,000)
Long-term debt	304,700,000	533,200,000
Foreign facilities
Debt Instrument
Long term debt	4,500,000	11,200,000
Revolving Credit Facility \| Senior secured revolving credit facility
Debt Instrument
Unamortized debt issuance costs	(9,900,000)
Long term debt	96,700,000
Revolving Credit Facility \| Senior secured revolving credit facility due 2022
Debt Instrument
Long term debt		329,300,000
Revolving Credit Facility \| Term loan
Debt Instrument
Long term debt	0	0
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Principal amount	258,800,000	258,800,000	$ 258,800,000
Unamortized discount	(46,600,000)	(50,400,000)
Unamortized debt issuance costs	(4,200,000)	(4,500,000)
Convertible Debt	$ 208,000,000.0	$ 203,900,000