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Investments, Forward Contracts and Fair Value Measurements - Contractual Maturities (Details)
$ in Millions
Sep. 29, 2018
USD ($)
Amortized Cost/ Carrying Cost  
Amounts maturing in less than 1 year $ 32.0
Amounts maturing in 1 - 5 years 18.6
Amounts maturing in more than 5 years 0.9
Total debt available-for-sale securities 51.5
Estimated Fair Value  
Amounts maturing in less than 1 year 31.7
Amounts maturing in 1 - 5 years 18.3
Amounts maturing in more than 5 years 0.7
Total debt available-for-sale securities $ 50.7