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Financial Instruments (Realized Gains and Losses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Proceeds from sales	$ 43.3	$ 38.0
Realized gross gains on sales	1.1	0.9
Realized gross losses on sales	$ 0.4	$ 0.8

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- Definition

Available for Sale Securities and Equity Securities, FV-NI, Realized Gain

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- Definition

Available for sale Securities and Equity Securities, FV-NI, Realized Loss

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- Definition

Proceeds from Sale of Equity and Available for Sale Securities

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