Significant Accounting Policies Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) Months	Dec. 31, 2020 USD ($)
Number of months or less of maturity to be considered cash equivalent | Months	3
Allowance for doubtful accounts receivable, current	$ 2.3	$ 5.6
Unbilled receivables,current	$ 98.1	$ 80.5