Revenue - Change in Contract Assets and Liabilities (Details) $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Contract assets
Beginning balance accounts receivable, net of allowances	$ 236.3
Change in accounts receivable, net of allowances	40.6
Ending balance accounts receivable, net of allowances	276.9
Beginning balance unbilled contract revenue	93.5
Change in unbilled contract revenue	25.4
Ending balance unbilled contract revenue	$ 118.9
Change in accounts receivable, net of allowances (as a percentage)	17.20%
Change in unbilled contract revenue, net of allowances (as a percentage)	27.20%
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	49.1
Ending balance customer advances and billings in excess of contract revenue	197.6
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)	33.10%
Change in long-term deferred revenue (as a percentage)	(75.00%)