Shareholders' Equity (Schedule Of Accumulated Other Comprehensive Income Activity) (Parenthetical) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income before reclassifications, tax expense (benefit)	$ (12.8)	$ (4.6)
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income before reclassifications, tax expense (benefit)	(1.8)	1.8
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income before reclassifications, tax expense (benefit)	(10.9)	$ (6.4)
AFI [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Separation of AFI, tax (benefit)	(39.2)
AFI [Member] | Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Separation of AFI, tax (benefit)	$ (39.2)