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Revenues from Contracts (Contract Balances) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Unbilled receivables $ 268.0 $ 241.7
Contract liabilities - current (1,036.9) (1,012.0)
Deferred revenue - non-current (76.4) (43.1)
Net contract assets/(liabilities) (845.3) $ (813.4)
Change in unbilled receivables 26.3  
Change in contract liabilities - current (24.9)  
Change in deferred revenue - non-current (33.3)  
Change in net contract assets/(liabilities) $ (31.9)