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Senior Notes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2017
Long-Term Debt
Loss on extinguishment of debt	$ 0.0	$ 0.0	$ 1.1	$ 0.0	$ 0.2	$ 9.3	$ 7.7	$ 0.0	$ 1.1	$ 17.2	$ 0.0
Current maturities of long-term debt	$ 154.6				$ 288.7				$ 154.6	288.7
Senior Notes [Member]
Long-Term Debt
Senior notes face amount												$ 950.0
Senior notes stated interest rate	5.125%								5.125%			5.125%
Face amount of senior notes repurchased			140.0			$ 600.0
Loss on extinguishment of debt			$ 0.7							$ 9.5

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