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Financial Instruments and Risk Management (Derivative Notional Amounts) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 30, 2017
Jul. 01, 2017
Foreign exchange contracts [Member] | Hedge [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount $ 209.6 $ 162.7 $ 157.8
Foreign exchange contracts [Member] | Non-hedge [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount 0.0 0.0 6.6
Interest rate swaps [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount 395.5 446.9 475.2
Cross currency swap [Member]      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Notional amount $ 106.4 $ 106.4 $ 106.4