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Contract Balances - Contract Balances (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Unbilled receivables $ 183.5 $ 169.4
Contract liabilities - current (840.8) (714.1)
Deferred revenue - non-current (33.2) (29.8)
Net contract assets/(liabilities) (690.5) $ (574.5)
Change in unbilled receivables - current 14.1  
Change in contract liabilities - current (126.7)  
Change in deferred revenue - non-current (3.4)  
Change in net contract assets/(liabilities) $ (116.0)