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Financial Instruments (Realized Gains and Losses) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Fair Value Disclosures [Abstract]        
Proceeds from sales $ 44.4 $ 194.8 $ 87.7 $ 232.8
Realized gross gains on sales 0.7 2.7 1.8 3.6
Realized gross losses on sales $ 0.4 $ 7.2 $ 0.8 $ 8.0