Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Income (Loss) Attributable to Parent [Abstract]
Income from continuing operations	$ 865.1	$ 718.9	$ 858.0
Less: dividends declared	172.7	160.5	134.6
Undistributed earnings	$ 692.4	$ 558.4	$ 723.4
Percent allocated to common stockholders	99.80%	99.80%	99.80%
Undistributed earnings available to common shareholders	$ 691.1	$ 557.1	$ 721.8
Add: dividends declared to common shares, restricted share units and vested and deferred restricted and performance shares	172.3	160.2	134.3
Income from continuing operations attributable to common stockholders	$ 863.4	$ 717.3	$ 856.1
Shares:
Basic weighted-average shares outstanding (in shares)	46.5	49.9	51.8
Effect of dilutive securities:
Performance awards (in shares)	0.2	0.1	0.2
Stock options (in shares)	0.4	0.4	0.5
Diluted weighted-average shares outstanding (in shares)	47.1	50.4	52.5
Per share income from continuing operations attributable to common shares:
Basic (in dollars per share)	$ 18.58	$ 14.38	$ 16.53
Diluted (in dollars per share)	$ 18.34	$ 14.22	$ 16.30
Basic weighted-average shares outstanding (in shares)	46.5	49.9	51.8
Basic weighted-average shares outstanding and unvested restricted shares expected to vest (in shares)	46.6	50.0	51.9
Percent allocated to common stockholders	99.80%	99.80%	99.80%
Anti-dilutive stock options excluded from EPS calculation
Income from discontinued operations attributable to common stockholders for basic earnings per share	$ 445.8	$ 48.5	$ 65.8
Income from discontinued operations attributable to common stockholders for dilutive earnings per share	445.8	48.5	65.8
Net income attributable to common stockholders for basic earnings per share	1,309.3	765.6	921.8
Net income attributable to common stockholders for diluted earnings per share	$ 1,309.3	$ 765.6	$ 921.8
Antidilutive stock options excluded from earnings per share calculation (in shares)	0.0	0.6	0.2