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Financial Instruments (Details 3) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]        
Proceeds from maturities and sales $ 633.5 $ 1,490.6 $ 1,452.7 $ 3,879.9
Realized gains 0.1 6.1 0.3 11.8
Realized losses $ (0.5) $ (5.2) $ (1.2) $ (24.3)