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Accumulated Other Comprehensive Income (Loss) - Reclassifications Out of Accumulated OCI (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Sep. 29, 2018
Sep. 30, 2017
Dec. 30, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Interest expense $ (12.4) $ (13.1) $ (38.0) $ (38.8) $ (52.4) $ (52.2)
Income tax benefit (51.5) (57.2) (164.9) (187.1)    
Earnings before income taxes and equity earnings 219.0 193.9 681.1 624.9 $ 821.9 $ 801.4
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 167.4 137.1 516.9 439.0    
Reclassification out of AOCI            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest (5.6) (3.8) (16.6) (11.7)    
Reclassification out of AOCI | Cash Flow Hedges            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Interest expense 0.4 0.5 1.2 1.2    
Income tax benefit 0.0 0.0 0.0 0.0    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 0.4 0.5 1.2 1.2    
Reclassification out of AOCI | Defined Benefit Pension and Postretirement Plans            
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]            
Income tax benefit 1.8 2.3 5.6 6.9    
Earnings before income taxes and equity earnings (7.8) (6.6) (23.4) (19.8)    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ (6.0) $ (4.3) $ (17.8) $ (12.9)