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Financial Instruments (Unrealized Gains and Losses) (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
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Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |
Unrealized gross gains | $ 0.6 | $ 0.6
Unrealized gross losses | 44.6 | 49.2
Fair value of securities in an unrealized gain position | 54.6 | 46.8
Fair value of securities in an unrealized loss position | $ 570.6 | $ 568.7

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