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Fair Value of Financial Instruments (Details) - Level 1 [Member] - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Other Assets [Member]
Fair Values of Financial Instruments [Abstract]
Deferred compensation plans	$ 8.8	$ 7.9
Other Liabilities [Member]
Fair Values of Financial Instruments [Abstract]
Deferred compensation plans	$ 8.9	$ 8.1

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