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Financial Instruments (Realized Gains and Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fair Value Disclosures [Abstract] |  |  |  |
Proceeds from sales | $ 44.4 | $ 194.8 | $ 87.7 | $ 232.8
Realized gross gains on sales | 0.7 | 2.7 | 1.8 | 3.6
Realized gross losses on sales | $ 0.4 | $ 7.2 | $ 0.8 | $ 8.0

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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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