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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, 2021
Dec. 31, 2020
Changes In Equity And Comprehensive Income [Line Items]    
Accumulated other comprehensive loss, beginning balance $ (466.4)  
Other comprehensive income (loss) before reclassifications (35.7)  
Amounts reclassified from accumulated other comprehensive income 4.9  
Net current-period othre comprehensive income (loss) (30.8)  
Accumulated other comprehensive loss, ending balance (497.2)  
Deferred tax assets, other comprehensive loss 149.5 $ 148.2
Accumulated Defined Benefit Plans Adjustment    
Changes In Equity And Comprehensive Income [Line Items]    
Accumulated other comprehensive loss, beginning balance (397.9)  
Net current-period othre comprehensive income (loss) 4.9  
Accumulated other comprehensive loss, ending balance (393.0)  
Accumulated Translation Adjustment    
Changes In Equity And Comprehensive Income [Line Items]    
Accumulated other comprehensive loss, beginning balance (68.5)  
Other comprehensive income (loss) before reclassifications (35.7)  
Net current-period othre comprehensive income (loss) (35.7)  
Accumulated other comprehensive loss, ending balance $ (104.2)