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Retirement and Post Retirement Health Care Plans (Schedule Of Fair Value Of Plan Assets) (Details) - USD ($)
$ in Millions
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 174.0 $ 185.3  
Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 94.6 115.4  
Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 10.3 9.6 $ 10.0
Net Asset Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 69.1 60.3  
Investments measured at net asset value 69.1 60.3  
Net Asset Value | Common Collective Trust Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 61.7 51.7  
Net Asset Value | Global Emerging Markets Fund Limited Partnership      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 7.4 8.6  
Cash and Cash Equivalents | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 3.9 4.4  
Cash and Cash Equivalents | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Cash and Cash Equivalents | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Common Stock | Level 1 | Domestic Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 22.4 27.1  
Common Stock | Level 1 | International Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 13.7 14.6  
Common Stock | Level 2 | Domestic Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Common Stock | Level 2 | International Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Common Stock | Level 3 | Domestic Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Common Stock | Level 3 | International Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 1 | U.S. Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 24.8 25.4  
Mutual Funds | Level 1 | Balanced Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 8.5 19.0  
Mutual Funds | Level 1 | International Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 2.5 8.3  
Mutual Funds | Level 1 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 17.3 15.1  
Mutual Funds | Level 1 | Other Plan Asset Category      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1.5 1.5  
Mutual Funds | Level 1 | Real Estate Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 2 | U.S. Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 2 | Balanced Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 2 | International Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 2 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 2 | Other Plan Asset Category      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 2 | Real Estate Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 3 | U.S. Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 3 | Balanced Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 3 | International Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 3 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 3 | Other Plan Asset Category      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 0.0 0.0  
Mutual Funds | Level 3 | Real Estate Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 10.3 9.6  
Estimate of Fair Value      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 104.9 125.0  
Estimate of Fair Value | Cash and Cash Equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 3.9 4.4  
Estimate of Fair Value | Common Stock | Domestic Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 22.4 27.1  
Estimate of Fair Value | Common Stock | International Equities      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 13.7 14.6  
Estimate of Fair Value | Mutual Funds | U.S. Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 24.8 25.4  
Estimate of Fair Value | Mutual Funds | Balanced Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 8.5 19.0  
Estimate of Fair Value | Mutual Funds | International Equity Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 2.5 8.3  
Estimate of Fair Value | Mutual Funds | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 17.3 15.1  
Estimate of Fair Value | Mutual Funds | Other Plan Asset Category      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets 1.5 1.5  
Estimate of Fair Value | Mutual Funds | Real Estate Investment      
Defined Benefit Plan Disclosure [Line Items]      
Fair Value of Plan Assets $ 10.3 $ 9.6