Income Taxes (Reconciliation Of The Beginning And Ending Amount Of Unrecognized Tax Benefits) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 48.1
Additions for tax positions related to prior years	3.0
Reductions for tax positions of prior years	(10.6)
Income Tax Audit Settlements	(21.0)
Other	0.3
Ending balance	19.8
Liabilities for Unrecognized Tax Benefits
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	36.4
Additions for tax positions related to prior years	1.1
Reductions for tax positions of prior years	(6.4)
Income Tax Audit Settlements	(16.6)
Other	(1.0)
Ending balance	13.5
Interest / Penalties
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	11.7
Additions for tax positions related to prior years	1.9
Reductions for tax positions of prior years	(4.2)
Income Tax Audit Settlements	(4.4)
Other	1.3
Ending balance	$ 6.3