Employee Benefit Plans (Components Of Net Pension (Expense) Income) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Service cost	$ 5.1	$ 5.1	$ 4.0
Interest cost	6.0	7.2	8.5
Expected return on plan assets	(12.5)	(11.9)	(11.3)
Recognized net actuarial loss	5.3	4.0	2.9
Prior service cost	0.0	(0.4)	1.7
Curtailments and settlements	(0.2)	0.0	0.0
Net pension expense	$ 3.7	$ 4.0	$ 5.8
Weighted average assumptions for pension costs:
Discount rate used in net pension costs	2.10%	2.80%	3.90%
Rate of compensation increase used in pension costs	3.50%	3.40%	3.00%
Expected return on plan assets	5.90%	6.10%	6.40%
Weighted average assumptions for benefit obligation:
Discount rate used in benefit obligation	2.50%	2.10%	2.80%
Rate of compensation increase used in benefit obligation	3.50%	3.50%	3.40%