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Revenue - Change in Contract Assets and Liabilities (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2019
USD ($)
Contract assets  
Beginning accounts receivable, net of allowances $ 194.8
Change in accounts receivable 9.6
Ending accounts receivable, net of allowances 204.4
Beginning unbilled contract revenue 54.5
Change in unbilled contract revenue 16.1
Ending unbilled contract revenue $ 70.6
Change in accounts receivable (as a percentage) 4.90%
Change in unbilled contract revenue (as a percentage) 29.50%
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 (1.7)
Ending balance customer advances and billings in excess of contract revenue 128.3
Beginning long-term deferred revenue 1.4
Change in long-term deferred revenue (0.8)
Ending long-term deferred revenue $ 0.6
Change in customer advances and billings in excess of contract revenue (as a percentage) (1.30%)
Change in long-term deferred revenue (as a percentage) (57.10%)