Pension And Other Benefit Plans - Funded Status Of Pension Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in plan assets:
Funded status	$ (35.9)	$ (23.1)
Defined benefit pension plans
Change in pension benefit obligation:
Benefit obligation at beginning of year	(97.5)	(129.1)
Service cost	(4.5)	(5.5)	$ (7.3)
Interest cost	(3.8)	(1.8)	(1.2)
Employee contributions	(2.4)	(2.5)
Benefits and other expenses paid	2.4	3.0
Actuarial (loss) gain	(8.6)	27.3
Amendments, settlements and curtailments	10.6	7.7
Foreign exchange rate impact	(7.6)	3.4
Benefit obligation at end of year	(111.4)	(97.5)	(129.1)
Change in plan assets:
Fair value of plan assets at beginning of year	74.4	80.6
Actual return on plan assets	2.7	(1.7)
Employer contributions	5.2	5.5
Employee contributions	2.4	2.5
Amendments and settlements	(11.6)	(6.6)
Benefits and other expenses paid	(2.5)	(3.1)
Foreign exchange rate impact	4.9	(2.8)
Fair value of plan assets at end of year	$ 75.5	$ 74.4	$ 80.6