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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The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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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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Face (par) amount of debt instrument at time of issuance.

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Amount, after accumulated amortization, of debt discount.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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 ($)	Jun. 30, 2018	Dec. 31, 2017	Nov. 06, 2017	Aug. 03, 2011
Debt Instrument
Total debt, net of unamortized discount and debt issuance costs	$ 510,700,000	$ 498,100,000
Less: current maturities	(66,800,000)	(58,900,000)
Long-term debt	443,900,000	439,200,000
Foreign facilities
Debt Instrument
Long term debt	10,100,000	7,900,000
Revolving Credit Facility
Debt Instrument
Long term debt	244,000,000	239,000,000
Revolving Credit Facility \| Senior secured revolving credit facility due November 2022
Debt Instrument
Unamortized debt issuance costs	(2,200,000)
Long term debt	238,000,000
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Principal amount	258,800,000	258,800,000	$ 258,800,000.0
Unamortized discount	(54,100,000)	(57,600,000)
Unamortized debt issuance costs	(4,800,000)	(5,100,000)
Convertible Debt	199,900,000	196,100,000
Convertible Debt \| Convertible Notes, Due 2018
Debt Instrument
Principal amount	57,100,000.0	57,100,000		$ 250,000,000.0
Unamortized discount	(400,000)	(1,900,000)
Unamortized debt issuance costs	0	(100,000)
Convertible Debt	56,700,000	$ 55,100,000	$ 184,700,000
Convertible debt, current	$ 56,700,000