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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 430.6 $ 522.0
Accounts receivable, net - current, Addition (Reduction) (91.4)  
Accounts receivable, net - non-current 60.1 53.6
Accounts receivable, net - non-current, Addition (Reduction) 6.5  
Contract asset - current 20.2 18.8
Contract asset - current, Addition (Reduction) 1.4  
Contract asset - non-current 6.0 10.5
Contract asset - non-current, Addition (Reduction) (4.5)  
Deferred revenue - current 89.4 116.6
Deferred revenue - current, Addition (Reduction) (27.2)  
Deferred revenue 59.8 $ 61.3
Deferred revenue - non-current, Addition (Reduction) $ (1.5)