Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, income tax (benefit) expense	$ 10.9	$ (16.0)	$ 1.2
Unrealized income (loss) for the period, income tax (benefit) expense	(1.3)	4.6	2.9
Reclassification adjustment for unrecognized gain during the period included in base compensation expense, income tax (benefit) expense	$ (0.1)	$ 0.3	$ 0.7