Accumulated Other Comprehensive (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Parenthetical) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income before reclassifications, tax expense (benefit)	$ 1.0	$ 1.3
AFI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Separation of AFI, tax (benefit)	(37.8)
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income before reclassifications, tax expense (benefit)	2.5	(0.7)
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income before reclassifications, tax expense (benefit)	(1.5)	$ 2.0
Pension And Postretirement Adjustments [Member] | AFI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Separation of AFI, tax (benefit)	$ (37.8)