Changes In Equity And Accumulated Other Comprehensive Loss (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (483.7)
Other comprehensive income (loss) before reclassifications	(45.0)
Amounts reclassified from accumulated other comprehensive income	3.4
Net current-period othre comprehensive income (loss)	(41.6)
Accumulated other comprehensive loss, ending balance	(525.3)
Deferred tax assets, other comprehensive loss	136.4	$ 135.4
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(366.0)
Other comprehensive income (loss) before reclassifications	0.2
Net current-period othre comprehensive income (loss)	3.6
Accumulated other comprehensive loss, ending balance	(362.4)
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(117.7)
Other comprehensive income (loss) before reclassifications	(45.2)
Amounts reclassified from accumulated other comprehensive income	0.0
Net current-period othre comprehensive income (loss)	(45.2)
Accumulated other comprehensive loss, ending balance	$ (162.9)