Accumulated Other Comprehensive (Loss) (Components of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 768.8	$ 649.1
Other comprehensive (loss) income before reclassifications, net of tax expense (benefit)	(15.9)	(14.3)
Amounts reclassified from accumulated other comprehensive (loss)	27.2	25.0
Net current period other comprehensive (loss) income	11.3	10.7
Balance	259.1	783.2
AFI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Separation of AFI, net of tax (benefit)	56.8
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(33.8)	(8.3)
Other comprehensive (loss) income before reclassifications, net of tax expense (benefit)	(13.8)	(21.3)
Net current period other comprehensive (loss) income	(13.8)	(21.3)
Balance	(52.2)	(29.6)
Foreign Currency Translation Adjustments [Member] | AFI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Separation of AFI, net of tax (benefit)	(4.6)
Derivative Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(3.3)	(4.0)
Other comprehensive (loss) income before reclassifications, net of tax expense (benefit)	(4.9)	2.1
Amounts reclassified from accumulated other comprehensive (loss)	6.1	(2.3)
Net current period other comprehensive (loss) income	1.2	(0.2)
Balance	(2.5)	(4.2)
Derivative Adjustments [Member] | AFI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Separation of AFI, net of tax (benefit)	(0.4)
Pension And Postretirement Adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(450.3)	(483.2)
Other comprehensive (loss) income before reclassifications, net of tax expense (benefit)	2.8	4.9
Amounts reclassified from accumulated other comprehensive (loss)	21.1	27.3
Net current period other comprehensive (loss) income	23.9	32.2
Balance	(364.6)	(451.0)
Pension And Postretirement Adjustments [Member] | AFI [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Separation of AFI, net of tax (benefit)	61.8
Accumulated Other Comprehensive (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(487.4)	(495.5)
Balance	$ (419.3)	$ (484.8)