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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Gains on cash flow hedges:    
Interest expense $ (12.5) $ (13.6)
Amortization of net unrecognized losses and prior service credits 1.5 2.8
Income tax expense (56.9) (57.6)
Net earnings 182.1 166.8
Reclassification out of AOCI    
Gains on cash flow hedges:    
Net earnings (4.1) (5.3)
Cash Flow Hedges | Reclassification out of AOCI    
Gains on cash flow hedges:    
Interest expense 0.4 0.5
Income tax expense 0.0 0.0
Net earnings 0.4 0.5
Defined Benefit Pension and Postretirement Plans | Reclassification out of AOCI    
Gains on cash flow hedges:    
Amortization of net unrecognized losses and prior service credits (5.8) (7.6)
Income tax expense 1.3 1.8
Net earnings $ (4.5) $ (5.8)