Debt and Credit Arrangements - Interest Expense and Financing Cost Amortization (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument
Financing costs amortization	$ 0.7	$ 1.2	$ 2.1	$ 3.5
Revolving Credit Facility
Debt Instrument
Interest expense, debt	6.4	2.9	14.7	6.0
Financing costs amortization	0.5	1.0	1.4	2.8
Revolving Credit Facility | Senior secured revolving credit facility due October 2026
Debt Instrument
Interest expense, debt	6.4	0.0	14.7	0.0
Financing costs amortization	0.5	0.0	1.4	0.0
Revolving Credit Facility | Term long due June 2024
Debt Instrument
Interest expense, debt	0.0	1.3	0.0	2.4
Financing costs amortization	0.0	1.0	0.0	2.8
Revolving Credit Facility | Interest expense, senior secured revolving credit facilities due 2024
Debt Instrument
Interest expense, debt	$ 0.0	$ 1.6	$ 0.0	$ 3.6