Net Income Per Unrestricted Share - Reconciliation of Numerator and Denominator Used in Calculation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Net Loss	$ (80.1)	$ (86.3)
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares	0.0	0.0
Diluted Net Loss Attributed to Unrestricted Shares	$ (80.1)	$ (86.3)
Weighted-Average Unrestricted Shares Outstanding (in shares)	63,946,600	63,743,700
Equity-based Compensation Equivalent Shares (in shares)	0	0
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution (in shares)	63,946,600	63,743,700
Basic (in dollars per share)	$ (1.25)	$ (1.36)
Diluted (in dollars per share)	$ (1.25)	$ (1.36)
Common Stock
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Net Loss	$ (80.1)	$ (86.3)
Participating Awards
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Net Loss	$ 0.0	$ 0.0