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Revenue - Change in Contract Assets and Liabilities (Details)
$ in Millions
 6 Months Ended
Jun. 30, 2022
USD ($)
Contract assets  
Beginning balance accounts receivable, net of allowances $ 236.3
Change in accounts receivable, net of allowances 42.9
Ending balance accounts receivable, net of allowances 279.2
Beginning balance unbilled contract revenue 93.5
Change in unbilled contract revenue 36.6
Ending balance unbilled contract revenue $ 130.1
Change in accounts receivable, net of allowances (as a percentage) 18.20%
Change in unbilled contract revenue, net of allowances (as a percentage) 39.10%
Contract liabilities  
Beginning balance customer advances and billings in excess of contract revenue $ 148.5
Change in customer advances and billings in excess of contract revenue 56.9
Ending balance customer advances and billings in excess of contract revenue 205.4
Beginning balance long-term deferred revenue 0.4
Change in long-term deferred revenue (0.3)
Ending balance long-term deferred revenue $ 0.1
Change in customer advances and billings in excess of contract revenue (as a percentage) 38.30%
Change in long-term deferred revenue (as a percentage) (75.00%)