Changes In Equity And Comprehensive Income (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (298.8)
Other comprehensive income (loss) before reclassifications	(70.5)
Amounts reclassified from accumulated other comprehensive income	6.0
Net current-period othre comprehensive income (loss)	(64.5)
Accumulated other comprehensive loss, ending balance	(363.4)	$ (298.8)
Changes in pension and post-retirement plan assets and benefit obligation, Tax benefit	111.7	114.4
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(257.8)
Other comprehensive income (loss) before reclassifications	0.0
Net current-period othre comprehensive income (loss)	6.0
Accumulated other comprehensive loss, ending balance	(251.8)	(257.8)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(40.9)
Other comprehensive income (loss) before reclassifications	(70.5)
Amounts reclassified from accumulated other comprehensive income	0.0
Net current-period othre comprehensive income (loss)	(70.5)
Accumulated other comprehensive loss, ending balance	$ (111.4)	$ (40.9)