Income Taxes - Schedule Of reconciliation of Beginning And Ending Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of year	$ 12.0	$ 10.8	$ 9.7
Additions for tax positions taken in current year	0.9	1.2	1.0
Additions for tax positions taken in prior period	0.1	0.0	0.8
Decreases related to sustained tax positions	0.0	0.0	(0.7)
Balance, end of year	$ 13.0	$ 12.0	$ 10.8