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Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Level 1 [Member]
Fair Values of Financial Instruments [Abstract]
Deferred compensation plans	$ 6.4	$ 6.0

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- References

No definition available.

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- Definition

Fair value portion of other assets.

+ References

No definition available.

+ Details

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- Details

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