Accounting Standards and Significant Accounting Policies (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle
Accounts receivable, net	$ 518.0	$ 585.5
Allowance for losses	14.8	14.8
Unbilled Revenues
New Accounting Pronouncements or Change in Accounting Principle
Accounts receivable, net	131.4	135.4
Unbilled Revenues | Retention Receivable
New Accounting Pronouncements or Change in Accounting Principle
Accounts receivable, net	$ 8.2	$ 8.6