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Financial Instruments (Unrealized Gains and Losses) (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Unrealized gross gains $ 0.6 $ 9.7
Unrealized gross losses 49.2 5.2
Fair value of securities in an unrealized gain position 46.8 250.7
Fair value of securities in an unrealized loss position $ 568.7 $ 290.2