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Debt and Credit Arrangements - Notes Interest Accretion Schedule (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Nov. 06, 2017
Debt Instrument
Interest expense excluding amortization	$ 4.4	$ 2.2	$ 7.6	$ 4.2
Financing costs amortization	0.7	1.1	1.4	2.3
Convertible Debt | Convertible Notes, due 2024
Debt Instrument
Interest expense excluding amortization	0.7	0.7	1.3	1.3
Financing costs amortization	$ 0.3	$ 0.3	$ 0.5	$ 0.5
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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