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Performance Bonds and Guaranty Fund Contributions (Performance Bond Deposits and Security Deposits) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Letters of Credit Outstanding, Amount $ 6,343.2 $ 4,685.2
Performance Bond [Member]    
Letters of Credit Outstanding, Amount 3,739.5 3,394.8
Delivery [Member]    
Letters of Credit Outstanding, Amount $ 2,603.7 $ 1,290.4