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 | |