Changes In Equity And Comprehensive Income (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (476.1)
Other comprehensive income (loss) before reclassifications	84.7
Amounts reclassified from accumulated other comprehensive income	6.8
Net current-period othre comprehensive income (loss)	91.5
Accumulated other comprehensive loss, ending balance	(384.6)
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	0.1
Net current-period othre comprehensive income (loss)	6.9
Accumulated other comprehensive loss, ending balance	(294.4)
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	84.6
Amounts reclassified from accumulated other comprehensive income	0.0
Net current-period othre comprehensive income (loss)	84.6
Accumulated other comprehensive loss, ending balance	$ (90.2)