Overview, Basis of Presentation and Significant Accounting Policies - Summary of Current Expected Credit Loss Reserve (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Balance, beginning of year	[1]	$ 12.7	$ 10.5
Provisions charged to expense		2.3	1.1
Write-offs, reclassifications and other		(0.5)	1.0
Balance, end of period	[1]	$ 14.5	$ 12.6

[1] As of March 31, 2022, the CECL reserve balance was comprised of a $13.5 million provision for accounts receivable and a $1.0 million provision for unbilled receivables and contract assets. As of December 31, 2021, the CECL reserve balance was comprised of a $12.0 million provision for accounts receivable and a $0.7 million provision for unbilled receivables and contract assets.