Changes In Equity And Comprehensive Income (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 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	31.8
Amounts reclassified from accumulated other comprehensive income	1.8
Net current-period othre comprehensive income (loss)	33.6
Accumulated other comprehensive loss, ending balance	(343.1)	$ (376.7)
Changes in pension and post-retirement plan assets and benefit obligation, Tax benefit	109.1	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	0.1
Net current-period othre comprehensive income (loss)	1.9
Accumulated other comprehensive loss, ending balance	(264.3)	(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	31.7
Amounts reclassified from accumulated other comprehensive income	0.0
Net current-period othre comprehensive income (loss)	31.7
Accumulated other comprehensive loss, ending balance	$ (78.9)	$ (110.6)