Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018	Nov. 06, 2017
Debt Instrument
Total debt, net of unamortized discount and debt issuance costs	$ 532,800,000	$ 544,400,000
Less: current maturities	214,800,000	11,200,000
Long-term debt	318,000,000	533,200,000
Foreign facilities
Debt Instrument
Long term debt	8,900,000	11,200,000
Revolving Credit Facility \| Senior secured revolving credit facility due November 2022
Debt Instrument
Unamortized debt issuance costs	(2,900,000)
Long term debt	318,000,000	329,300,000
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Principal amount	258,800,000	258,800,000	$ 258,800,000.0
Unamortized discount	(48,600,000)	(50,400,000)
Unamortized debt issuance costs	(4,300,000)	(4,500,000)
Convertible Debt	$ 205,900,000	$ 203,900,000

Including the current and noncurrent portions, carrying amount of debt identified as being convertible into another form of financial instrument (typically the entity's common stock) as of the balance sheet date, which originally required full repayment more than twelve months after issuance or greater than the normal operating cycle of the company.

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