Income Taxes - Income Tax Benefit (Expense) from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022		Dec. 31, 2021
Income Tax Disclosure [Abstract]
Current Income Tax Benefit (Expense)	$ 4.0	$ (6.2)		$ 122.7
Deferred Income Tax Benefit	70.8	90.6		2.9
Income Tax Benefit	$ 74.8	$ 84.4	[1]	$ 125.6	[1]

[1] As of January 1, 2023, the Company adopted ASU 2018-12 using the modified retrospective method applied as of the transition date of January 1, 2021. Prior period amounts in the financial statements have been recast to reflect application of the new guidance. See Note 2 to the Consolidated Financial Statements for additional information.