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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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Debt and Credit Arrangements - Summary of Outstanding Borrowings (Details) - USD ($)	Dec. 31, 2018	Aug. 01, 2018	Dec. 31, 2017	Nov. 06, 2017	Sep. 30, 2017
Debt Instrument
Debt, Long-term and Short-term, Combined Amount, Net of Unamortized Debt Issuance Costs and Debt Discounts	$ 544,400,000		$ 498,100,000
Less: current maturities	(11,200,000)		(58,900,000)
Long-term debt	533,200,000		439,200,000
Senior Secured Revolving Credit Facility, due 2022 \| Revolving Credit Facility
Debt Instrument
Unamortized debt issuance costs	(3,100,000)
Long-term debt, gross	329,300,000		239,000,000
Foreign Facilities
Debt Instrument
Long-term debt, gross	11,200,000		7,900,000
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Principal amount	258,800,000		258,800,000	$ 258,750,000
Unamortized discount	(50,400,000)		(57,600,000)
Unamortized debt issuance costs	(4,500,000)		(5,100,000)
Convertible notes, net of unamortized discount and debt issuance costs	203,900,000		196,100,000
Convertible Debt \| Convertible Notes, due 2018
Debt Instrument
Principal amount	0	$ 57,100,000.0	57,100,000		$ 250,000,000
Unamortized discount	0		(1,900,000)
Unamortized debt issuance costs	0		(100,000)
Convertible notes, net of unamortized discount and debt issuance costs	$ 0		55,100,000
Convertible debt, current			$ 55,100,000