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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash, Cash Equivalents and Restricted Cash:        
Cash and cash equivalents $ 2,819.4 $ 1,059.9    
Restricted cash 145.3 98.2    
Total cash, cash equivalents and restricted cash shown in the Statements of Consolidated Cash Flows 2,964.7 1,158.1 $ 410.0 $ 410.1
Allowance for Credit Losses [Member]        
Movement in valuation allowances and reserves [Roll Forward]        
Balance at beginning of period 46.5 12.4 11.5  
Charged to costs and expenses 7.2 8.4 1.2  
Charged to other accounts [1] 4.4 28.7 0.0  
Deductions (5.4) (3.0) (0.3)  
Balance at end of period $ 52.7 $ 46.5 $ 12.4  
Minor Investment [Member] | Minimum [Member]        
Consolidation Policy [Abstract]        
Equity method of ownership interest 3.00%      
Minor Investment [Member] | Maximum [Member]        
Consolidation Policy [Abstract]        
Equity method of ownership interest 50.00%      
Major Investment [Member] | Minimum [Member]        
Consolidation Policy [Abstract]        
Equity method of ownership interest 20.00%      
Major Investment [Member] | Maximum [Member]        
Consolidation Policy [Abstract]        
Equity method of ownership interest 50.00%      
[1] Amount presented for 2020 primarily relates to the reclassification of deferred revenue balances to allowance for credit losses in connection with customer bankruptcies and contractual disputes.