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Financial Instruments (Realized Gains and Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Fair Value Disclosures [Abstract]        
Proceeds from sales $ 50.5 $ 49.6 $ 115.6 $ 137.3
Realized gross gains on sales 0.0 0.4 0.2 2.2
Realized gross losses on sales $ 7.5 $ 0.3 $ 9.0 $ 1.1