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Financial Instruments (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value Disclosures [Abstract] |  |  |  |
Proceeds from sales | $ 49.6 | $ 14.0 | $ 137.3 | $ 246.8
Realized gross gains on sales | 0.4 | 0.4 | 2.2 | 4.0
Realized gross losses on sales | $ 0.3 | $ 0.2 | $ 1.1 | $ 8.2

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- Definition Available for sale Securities and Equity Securities, FV-NI, Realized Loss + References No definition available. + Details
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- References No definition available. + Details
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