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Revenue (Contract with Customer, Asset and Liability) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Revenue from Contract with Customer [Abstract]    
Accounts receivable, net - current $ 447.2 $ 383.7
Accounts receivable, net - current, Addition (Reduction) 63.5  
Accounts receivable, net - non-current 57.3 49.4
Accounts receivable, net - non-current, Addition (Reduction) 7.9  
Contract asset - current 28.7 25.6
Contract asset - current, Addition (Reduction) 3.1  
Contract asset - non-current 10.6 10.3
Contract asset - non-current, Addition (Reduction) 0.3  
Deferred revenue - current 177.5 165.7
Deferred revenue - current, Addition (Reduction) 11.8  
Deferred revenue 53.1 $ 56.2
Deferred revenue - non-current, Addition (Reduction) $ (3.1)