Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments, Fair Value of Other Financial Instruments (Details)

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Financial Instruments, Fair Value of Other Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Apr. 01, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]      
Fair Value of the Company's Long-Term Debt Including Current Maturities $ 497.6 $ 492.1 $ 494.2
Long-Term Debt $ 438.8 $ 439.1 $ 441.3