Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 55.1	$ 36.8	$ 50.9
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	(1.7)	(42.1)
Increases related to current year tax positions	0.0	0.0	0.0
Settlements	(0.7)	(23.3)	(7.7)
Reductions due to lapse of applicable statute of limitations	(0.6)	(0.5)	(7.3)
Balance at December 31	52.1	55.1	36.8
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions			0.9
Income Tax Disclosure [Line Items]
Unrecognized Tax Benefits	52.1	$ 55.1	$ 36.8
Unrecognized Tax Benefit Impact on ETR
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at December 31	12.1
Income Tax Disclosure [Line Items]
Unrecognized Tax Benefits	12.1
Unrecognized Tax Benefit PY Offset by VA
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at December 31	40.0
Income Tax Disclosure [Line Items]
Unrecognized Tax Benefits	$ 40.0