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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
	Mar. 31, 2022	Mar. 31, 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	(21.7)
Amounts reclassified from accumulated other comprehensive loss	3.3
Net period other comprehensive income (loss)	(18.4)
Accumulated other comprehensive loss, ending balance	(458.6)
Deferred tax assets, other comprehensive loss	119.1		$ 117.9
Reclassification out of Accumulated Other Comprehensive Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Amounts reclassified from accumulated other comprehensive loss	3.3	$ 4.9
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)	3.3
Accumulated other comprehensive loss, ending balance	(298.6)
Currency Translation Adjustment
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accumulated other comprehensive loss, beginning balance	(138.3)
Other comprehensive income (loss) before reclassifications	(21.7)
Net period other comprehensive income (loss)	(21.7)
Accumulated other comprehensive loss, ending balance	$ (160.0)