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Earnings per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 77.0	$ 95.3	$ 142.7	$ 163.3
Net income	$ 77.0	$ 95.3	$ 142.7	$ 163.3
Weighted average common shares outstanding – basic (in shares)	41.7	42.9	41.8	43.0
Dilutive impact of share-based compensation awards (in shares)	0.3	0.5	0.4	0.5
Weighted average common shares outstanding – diluted (in shares)	42.0	43.4	42.2	43.5
Share-Based Payment Arrangement
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings (in shares)	0.4	0.5	0.3	0.5
Convertible Debt Securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings (in shares)		1.6		1.6

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Amount, after deduction of tax, noncontrolling interests, dividends on preferred stock and participating securities; of income (loss) available to common shareholders.

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