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Accounting Policies (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 2,380.4 $ 2,338.5 $ 2,354.7 $ 2,078.2
Accumulated Foreign Currency Adjustment Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest (214.8) (207.8)    
Accumulated Gain (Loss), Net, Cash Flow Hedge        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 8.0      
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest   (5.4)    
Accumulated other comprehensive income (loss), tax 2.5 (1.7)    
Accumulated Defined Benefit Plans Adjustment Attributable to Parent        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest 31.0 38.2    
Accumulated other comprehensive income (loss), tax (9.5) (11.8)    
Accumulated Other Comprehensive Loss        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ (237.8) $ (251.4) $ (164.0) $ (318.1)