Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Earnings per Common Share
Net loss, basic	$ (15.0)	$ (38.0)
Net loss, diluted	$ (15.0)	$ (38.0)
Basic weighted-average shares	81,347,672	83,028,769
Diluted weighted-average shares	81,347,672	83,028,769
Basic and diluted (loss) earnings per common share
Basic (in dollars per share)	$ (0.18)	$ (0.46)
Diluted (in dollars per share)	$ (0.18)	$ (0.46)