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Revenue - Change in Contract Assets and Liabilities (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2019
USD ($)
Contract assets  
Beginning accounts receivable, net of allowances $ 194.8
Change in accounts receivable 29.7
Ending accounts receivable, net of allowances 224.5
Beginning unbilled contract revenue 54.5
Change in unbilled contract revenue 27.1
Ending unbilled contract revenue $ 81.6
Change in accounts receivable (as a percentage) 15.20%
Change in unbilled contract revenue (as a percentage) 49.70%
Contract liabilities  
Begining balance customer advances and billings in excess of contract revenue $ 130.0
Change in customer advances and billings in excess of contract revenue (9.5)
Ending balance customer advances and billings in excess of contract revenue 120.5
Beginning long-term deferred revenue 1.4
Change in long-term deferred revenue (0.4)
Ending long-term deferred revenue $ 1.0
Change in customer advances and billings in excess of contract revenue (as a percentage) (7.30%)
Change in long-term deferred revenue (as a percentage) (28.60%)