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Debt and Financing Obligations (Schedule of Debt) (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total borrowings	$ 690,500,000	$ 800,500,000
Original issue discount	(3,300,000)	(4,300,000)
Debt issuance costs	(10,300,000)	(13,300,000)
Total debt and financing obligation	676,900,000	782,900,000
Current portion of financing obligations	3,000,000.0	2,900,000
Long-term debt and financing obligations	673,900,000	780,000,000.0
Senior Notes, Due 2025 [Member] | Senior notes
Debt Instrument [Line Items]
Total borrowings	$ 587,300,000	650,000,000.0
Interest rate on senior notes (as a percent)	7.50%
$400.0 revolving credit facility, due 2024 ("Revolving Facility") | Line of Credit | Revolving credit facility
Debt Instrument [Line Items]
Total borrowings	$ 88,300,000	143,300,000
Principal amount of term loan	400,000,000.0
5.35 percent financing obligation, due 2024 | Financing Obligation
Debt Instrument [Line Items]
Total borrowings	$ 14,900,000	$ 7,200,000
Interest rate on senior notes (as a percent)	5.35%

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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