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Fair Value Measurements (Financial Assets and Liabilities Carried at Fair Value) (Details) - USD ($)
$ in Millions
Mar. 30, 2018
Dec. 31, 2017
Assets:    
Available-for-sale securities $ 43.2 $ 45.4
Liabilities:    
Deferred compensation plans 59.5 62.9
Quoted Prices in Active Market (Level 1)    
Assets:    
Available-for-sale securities 0.0 0.0
Liabilities:    
Deferred compensation plans 0.0 0.0
Significant Other Observable Inputs (Level 2)    
Assets:    
Available-for-sale securities 43.2 45.4
Liabilities:    
Deferred compensation plans 59.5 62.9
Significant Unobservable Inputs (Level 3)    
Assets:    
Available-for-sale securities 0.0 0.0
Liabilities:    
Deferred compensation plans $ 0.0 $ 0.0