Changes In Equity And Comprehensive Income (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (476.1)
Other comprehensive income (loss) before reclassifications	22.0
Amounts reclassified from accumulated other comprehensive income	2.3
Net current-period othre comprehensive income (loss)	24.3
Accumulated other comprehensive loss, ending balance	(451.8)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(301.3)
Other comprehensive income (loss) before reclassifications	0.0
Net current-period othre comprehensive income (loss)	2.3
Accumulated other comprehensive loss, ending balance	(299.0)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(174.8)
Other comprehensive income (loss) before reclassifications	22.0
Amounts reclassified from accumulated other comprehensive income	0.0
Net current-period othre comprehensive income (loss)	22.0
Accumulated other comprehensive loss, ending balance	$ (152.8)