Changes In Equity And Accumulated Other Comprehensive Loss (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	$ (447.6)
Other comprehensive income (loss) before reclassifications	(29.8)
Amounts reclassified from accumulated other comprehensive income	7.8
Net current-period othre comprehensive income (loss)	(22.0)
Accumulated other comprehensive loss, ending balance	(469.6)
Deferred tax assets, other comprehensive loss	119.8	$ 122.2
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(318.3)
Other comprehensive income (loss) before reclassifications	0.0
Net current-period othre comprehensive income (loss)	7.8
Accumulated other comprehensive loss, ending balance	(310.5)
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(129.3)
Other comprehensive income (loss) before reclassifications	(29.8)
Amounts reclassified from accumulated other comprehensive income	0.0
Net current-period othre comprehensive income (loss)	(29.8)
Accumulated other comprehensive loss, ending balance	$ (159.1)