Changes In Equity And Accumulated Other Comprehensive Loss (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail) $ in Millions	6 Months Ended
	Jun. 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	3.9
Amounts reclassified from accumulated other comprehensive income	4.8
Net current-period othre comprehensive income (loss)	8.7
Accumulated other comprehensive loss, ending balance	(438.9)
Deferred tax assets, other comprehensive loss	$ 120.9	$ 122.2
Document Period End Date	Jun. 30, 2019
Accumulated Defined Benefit Plans Adjustment [Member]
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)	4.8
Accumulated other comprehensive loss, ending balance	(313.5)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, beginning balance	(129.3)
Other comprehensive income (loss) before reclassifications	3.9
Amounts reclassified from accumulated other comprehensive income	0.0
Net current-period othre comprehensive income (loss)	3.9
Accumulated other comprehensive loss, ending balance	$ (125.4)