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Earnings per Common Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Earnings per Common Share
Net loss, basic	$ (22.4)	$ (104.5)	$ (48.2)	$ (244.2)
Net loss, diluted	$ (22.4)	$ (104.5)	$ (48.2)	$ (244.2)
Basic weighted-average shares	82,053,403	80,888,537	81,782,166	81,797,740
Diluted weighted-average shares	82,053,403	80,888,537	81,782,166	81,797,740
Basic and diluted (loss) earnings per common share
Basic (in dollars per share)	$ (0.27)	$ (1.29)	$ (0.59)	$ (2.99)
Diluted (in dollars per share)	$ (0.27)	$ (1.29)	$ (0.59)	$ (2.99)

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