Income Taxes - Significant Components (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current:
Federal	$ (15.5)	$ (1.3)	$ 1.7
State and local	6.6	3.5	3.2
Foreign	91.2	15.4	16.5
Total current	82.3	17.6	21.4
Deferred:
Federal	1.5	(5.6)	(5.8)
State and local	(1.8)	1.9	1.1
Foreign	(79.0)	2.0	(3.2)
Total deferred	(79.3)	(1.7)	(7.9)
Income tax expense, net	$ 3.0	$ 15.9	$ 13.5