Overview, Basis of Presentation and Significant Accounting Policies - Summary of Current Expected Credit Loss Reserve (Parenthetical) (Details) - USD ($) $ in Millions		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Accounts and Financing Receivable, Allowance for Credit Loss		$ 12.2		$ 10.1
Provision of unbilled receivables and contract assets		1.2		$ 0.4
Adoption of ASU 2016-13
Financing Receivable Allowance For Credit Losses [Line Items]
Prior period reclassification adjustment	$ 0.5	$ 0.0	$ 0.5