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Financial Instruments (Schedule of Investment Portfolio Activity) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Proceeds from sales | $ 174.7 | $ 264.8 | $ 431.6
Realized gross gains on sales | 2.8 | 4.5 | 4.9
Realized gross losses on sales | $ 1.7 | $ 8.2 | $ 3.0

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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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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- References No definition available. + Details
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