Schedule of Contract Related Balances (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Contract Liabilities And Other Disclosures
Accounts Receivable	$ 36.2	$ 30.4	$ 24.5
Unbilled Accounts Receivable	17.4	8.2	15.3
Deferred Income	(14.5)	(22.9)	(27.8)
Customer Prepayments and Deposits	$ (3.9)	$ (1.6)	$ (1.9)