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Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Nov. 06, 2017
Debt Instrument
Interest expense excluding amortization	$ 3.2	$ 2.0
Financing costs amortization	0.7	1.2
Convertible Debt | Convertible Notes, due 2024
Debt Instrument
Interest expense excluding amortization	0.6	0.6
Financing costs amortization	$ 0.2	$ 0.2
Debt instrument stated interest rate (percent)			1.00%

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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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