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Changes In Equity And Comprehensive Income (Classification Of Accumulated Other Comprehensive Income Reflected On Consolidated Balance Sheets) (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2018
USD ($)
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive loss, beginning balance $ (380.1)
Other comprehensive income (loss) before reclassifications (20.3)
Amounts reclassified from accumulated other comprehensive income 7.4
Net current-period othre comprehensive income (loss) (12.9)
Accumulated other comprehensive loss, ending balance (393.0)
Accumulated Defined Benefit Plans Adjustment [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive loss, beginning balance (292.1)
Other comprehensive income (loss) before reclassifications 9.4
Net current-period othre comprehensive income (loss) 16.8
Accumulated other comprehensive loss, ending balance (275.3)
Accumulated Translation Adjustment [Member]  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated other comprehensive loss, beginning balance (88.0)
Other comprehensive income (loss) before reclassifications (29.7)
Amounts reclassified from accumulated other comprehensive income 0.0
Net current-period othre comprehensive income (loss) (29.7)
Accumulated other comprehensive loss, ending balance $ (117.7)