Debt and Other Financing Arrangements - Narrative (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Line Of Credit Facility [Line Items]
Long-term Line of Credit	$ 57,000,000.0	$ 57,000,000.0		$ 57,000,000.0
Borrowing capacity	143,000,000.0	143,000,000.0
Receivables facility amount outstanding	179,500,000	179,500,000		$ 131,500,000
Letters of Credit Outstanding, Amount	12,400,000	12,400,000
Receivables Facility Remaining Borrowing Capacity	8,100,000	8,100,000
Receivables Facility Maximum Borrowing Availability	$ 200,000,000.0	200,000,000.0
Accounts Receivable Facility, Renewal Term	364 days
Accounts Receivable Facility, Expiration Year And Month	2023-05
Receivables facility maximum borrowing capacity	$ 200,000,000.0	200,000,000.0	$ 225,000,000.0
Accounts Receivable Sold		$ 0
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Receivable Facility, interest rate, stated percentage		0.75%
Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Debt instrument expiration date		2022-10