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Debt, Interest Income, Expense and Other Finance Costs - Schedule of Debt (Details) - USD ($)	Sep. 30, 2019	Jul. 23, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Finance Leases	$ 16,300,000
Finance Leases			$ 13,800,000
Total debt	687,400,000		701,000,000.0
Current maturities of long-term debt and finance leases	16,400,000		41,100,000
Long-term debt	671,000,000.0		659,900,000
Other
Debt Instrument [Line Items]
Long-term debt	2,200,000		2,300,000
Line of Credit | Credit Facility
Debt Instrument [Line Items]
Long-term debt	150,000,000.0		170,000,000.0
Senior Notes | Term Loans
Debt Instrument [Line Items]
Long-term debt	$ 518,900,000	$ 525,000,000.0	$ 514,800,000

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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

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