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Fair Value of Financial Instruments (Details) - Level 1 [Member] - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Other Assets [Member] |  |
Fair Values of Financial Instruments [Abstract] |  |
Deferred compensation plans | $ 9.2 | $ 7.9
Other Liabilities [Member] |  |
Fair Values of Financial Instruments [Abstract] |  |
Deferred compensation plans | $ 9.2 | $ 8.1

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