Revenue - Change in Contract Assets and Liabilities (Details) $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($)
Contract assets
Beginning balance accounts receivable, net of allowances	$ 278.4
Change in accounts receivable, net of allowances	468.7
Ending balance accounts receivable, net of allowances	747.1
Beginning balance unbilled contract revenue	133.7
Change in unbilled contract revenue	258.9
Ending balance unbilled contract revenue	$ 392.6
Change in accounts receivable, net of allowances (as a percentage)	168.40%
Change in unbilled contract revenue, net of allowances (as a percentage)	193.60%
Contract liabilities
Beginning balance customer advances and billings in excess of contract revenue	$ 170.6
Change in customer advances and billings in excess of contract revenue	282.9
Ending balance customer advances and billings in excess of contract revenue	453.5
Beginning balance long-term deferred revenue	0.3
Change in long-term deferred revenue	(0.3)
Ending balance long-term deferred revenue	$ 0.0
Change in customer advances and billings in excess of contract revenue (as a percentage)	165.80%
Change in long-term deferred revenue (as a percentage)	(100.00%)