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Revenue from Contracts with Customers Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Accounts receivable, net $ 1,238.2 $ 1,035.9
Deferred revenue, current 34.0 34.1
Deferred revenue, noncurrent 77.6 $ 78.8
Increase (decrease) in accounts receivable 202.3  
Contract liability, current, increase (decrease) (0.1)  
Contract liability, noncurrent, increase (decrease) (1.2)  
Contract liability, additions 6.7  
Contract with customer, liability, revenue recognized $ 8.0