Income Taxes (Reconciliation Of Gross Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits, beginning balance	$ 8.2	$ 10.1	$ 12.1
Gross increases—tax positions in prior periods	0.0	0.0	0.1
Gross decreases—tax positions in prior periods	(0.4)	(0.5)	(0.4)
Gross increases—current period tax positions	0.7	1.3	1.5
Change due to exchange rate fluctuations	0.0	(0.2)	0.3
Settlements	0.0	0.0	(0.9)
Lapse of statute of limitations	(2.1)	(2.5)	(2.6)
Gross unrecognized tax benefits, ending balance	6.4	8.2	10.1
Interest	1.9	2.4	3.0
Penalties	0.3	0.4	0.5
Total gross unrecognized tax benefits	$ 8.6	$ 11.0	$ 13.6