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Financial Instruments (Realized Gains and Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Proceeds from sales $ 60.0 $ 50.5 $ 121.8 $ 115.6
Realized gross gains on sales 0.3 0.0 0.6 0.2
Realized gross losses on sales $ 1.9 $ 7.5 $ 3.6 $ 9.0