Debt and Other Financing Arrangements - Notes due - Narrative (Details) - USD ($) $ in Millions	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2021	Sep. 07, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 1993	Nov. 30, 2021
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt	$ 1,145.0	$ 23.0		$ 0.0	$ 0.0
Debt instrument, interest rate, stated percentage							0.50%
Debt instrument maturity period			2028
Notes due 2023 [Member]
Debt Instrument [Line Items]
Proceeds from issuance of long-term debt						$ 50.0
Debt instrument, interest rate, stated percentage	7.25%		7.25%
Debt instrument maturity period			2023
Frequency of periodic interest payment			Interest on the 7 1/4% Notes is payable semi-annually on June 15 and December 15.
Customary Events of Default Amount for Existing Debt Instruments	$ 20.0		$ 20.0