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Revenues from Contracts (Contract Balances) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Unbilled receivables $ 194.4 $ 169.4
Contract liabilities - current (719.8) (714.1)
Deferred revenue - non-current (30.7) (29.8)
Net contract assets/(liabilities) (556.1) $ (574.5)
Change in unbilled receivables 25.0  
Change in contract liabilities - current (5.7)  
Change in deferred revenue - non-current (0.9)  
Change in net contract assets/(liabilities) $ 18.4