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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss, beginning balance			$ (440.2)
Other comprehensive income (loss) before reclassifications			(97.5)
Amounts reclassified from accumulated other comprehensive loss			6.8
Net period other comprehensive income (loss)			(90.7)
Accumulated other comprehensive loss, ending balance	$ (530.9)		(530.9)
Deferred tax assets, other comprehensive loss	120.1		120.1		$ 117.9
Reclassification out of Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss	3.5	$ 5.0	6.8	$ 10.1
Defined Benefit Pension and Postretirement Items
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss, beginning balance			(301.9)
Net period other comprehensive income (loss)			6.8
Accumulated other comprehensive loss, ending balance	(295.1)		(295.1)
Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss, beginning balance			(138.3)
Other comprehensive income (loss) before reclassifications			(97.5)
Net period other comprehensive income (loss)			(97.5)
Accumulated other comprehensive loss, ending balance	$ (235.8)		$ (235.8)