CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, unbilled services with related parties	$ 2.7	$ 2.6
Accounts payable includes related parties	0.3	0.2
Advanced billings with related parties	$ 8.3	$ 6.5
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock shares authorized	5,000,000	5,000,000
Preferred stock shares issued	0	0
Preferred stock shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock shares authorized	250,000,000	250,000,000
Common stock shares issued	36,006,778	35,519,989
Common stock shares outstanding	36,006,778	35,519,989
Treasury stock shares	180,000	185,000