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Financial Instruments (Schedule of Investment Portfolio Activity) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Proceeds from sales | $ 264.8 | $ 431.6 | $ 5,529.0
Realized gross gains on sales | 4.5 | 4.9 | 3.6
Realized gross losses on sales | $ 8.2 | $ 3.0 | $ 49.2

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- Definition Available for Sale Securities and Equity Securities, FV-NI, Realized Gain + References No definition available. + Details
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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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- Definition Proceeds from Sale of Equity and Available for Sale Securities + References No definition available. + Details
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- References No definition available. + Details
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