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Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument
Interest expense excluding amortization	$ 3.2	$ 6.5	$ 7.4	$ 21.2
Financing costs amortization	1.2	1.1	3.5	3.2
Revolving Credit Facility
Debt Instrument
Interest expense excluding amortization	2.9	3.8	6.0	13.2
Financing costs amortization	1.0	0.9	2.8	2.6
Revolving Credit Facility | Term loan
Debt Instrument
Interest expense excluding amortization	1.3	3.4	2.4	11.6
Revolving Credit Facility | Senior secured revolving credit facility
Debt Instrument
Interest expense excluding amortization	$ 1.6	$ 0.4	$ 3.6	$ 1.6

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

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- Definition

Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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