Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Reconciliation of information used in computing basic and diluted earnings per share [Abstract]
Net earnings (loss)	$ 7.8	$ (259.3)	$ 5.8	$ (256.8)
Basic earnings (loss) per common share:
Net earnings (loss) per share, basic	$ 0.09	$ (2.90)	$ 0.07	$ (2.87)
Basic (in shares)	86,900,000	89,400,000	87,300,000	89,500,000
Diluted earnings (loss) per common share:
Net earnings (loss) per share, diluted	$ 0.09	$ (2.88)	$ 0.07	$ (2.84)
Diluted (in shares)	87,600,000	89,900,000	88,300,000	90,400,000
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Loss from discontinued operations, net	$ 0	$ (2.93)	$ (0.01)	$ (2.88)
Earnings (loss) from continuing operations, per basic share	0.09	0.05	0.08	0.04
Earnings (loss) from continuing operations, per diluted share	$ 0.09	$ 0.05	$ 0.08	$ 0.04
Net earnings (loss)	$ 7.8	$ (259.3)	$ 5.8	$ (256.8)
Earnings from continuing operations	7.8	4.8	7.4	3.8
Accumulated Deficit
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Earnings from continuing operations	$ 7.8	$ 4.8	$ 7.4	$ 3.8
Share-based Payment Arrangement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average number of anti-dilutive shares excluded from the calculation (in shares)	1,800,000	1,200,000	1,100,000	1,700,000

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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