Changes In Equity And Comprehensive Income (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance		$ (376.7)
Other comprehensive income (loss) before reclassifications		12.0
Amounts reclassified from accumulated other comprehensive income		5.2
Net current-period othre comprehensive income (loss)		17.2
Accumulated other comprehensive loss, ending balance	$ (359.5)	(359.5)	$ (376.7)
Changes in pension and post-retirement plan assets and benefit obligation, Tax benefit	107.5		109.8
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance		(266.2)
Other comprehensive income (loss) before reclassifications		0.4
Net current-period othre comprehensive income (loss)		5.6
Accumulated other comprehensive loss, ending balance	(260.6)	(260.6)	(266.2)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance		(110.6)
Other comprehensive income (loss) before reclassifications		11.6
Amounts reclassified from accumulated other comprehensive income		0.0
Net current-period othre comprehensive income (loss)		11.6
Accumulated other comprehensive loss, ending balance	$ (99.0)	$ (99.0)	$ (110.6)