Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Nov. 06, 2017
Debt Instrument
Interest expense excluding amortization	$ 5.7	$ 3.2	$ 13.3	$ 7.4
Financing costs amortization	0.7	1.2	2.1	3.5
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Interest expense excluding amortization	0.6	0.6	1.9	1.9
Financing costs amortization	0.2	$ 0.2	0.7	$ 0.7
Debt instrument stated interest rate (percent)					1.00%
Debt issuance costs	$ 6.8		$ 6.8

Amount of amortization expense attributable to debt issuance costs.

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

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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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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