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Investments, Forward Contracts and Fair Value Measurements - Contractual Maturities (Details)
$ in Millions
Dec. 29, 2018
USD ($)
Amortized Cost/ Carrying Cost  
Amounts maturing in less than 1 year $ 19.9
Amounts maturing in 1 - 5 years 8.9
Amounts maturing in more than 5 years 0.9
Total debt available-for-sale securities 29.7
Estimated Fair Value  
Amounts maturing in less than 1 year 19.8
Amounts maturing in 1 - 5 years 8.7
Amounts maturing in more than 5 years 0.6
Total debt available-for-sale securities $ 29.1