Pension And Other Benefit Plans - (Funded Status Of Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in pension benefit obligation:
Service cost	$ (9.1)	$ (10.0)	$ (8.0)
Defined benefit pension plans
Change in pension benefit obligation:
Benefit obligation at beginning of year	(140.0)	(165.6)
Service cost	(9.1)	(10.0)
Interest cost	(2.4)	(2.0)
Employee contributions	(4.2)	(4.2)
Benefits and other expenses paid	6.2	7.2
Actuarial (loss) gain	(37.7)	12.3
Amendments, settlements and curtailments	(5.6)	18.7
Foreign exchange rate impact	(3.0)	3.6
Benefit obligation at end of year	(195.8)	(140.0)	(165.6)
Change in plan assets:
Fair value of plan assets at beginning of year	90.2	106.5
Actual return on plan assets	7.7	0.3
Employer contributions	8.2	7.5
Employee contributions	4.2	4.2
Amendments and settlements	0.8	(18.6)
Benefits and other expenses paid	(6.2)	(7.2)
Foreign exchange rate impact	2.4	(2.5)
Fair value of plan assets at end of year	107.3	90.2	$ 106.5
Funded status	$ (88.5)	$ (49.8)