Summary of Significant Accounting Policies (Additional Information) (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Aug. 31, 2023	Aug. 31, 2021
Accounting Policies [Line Items]
Shares authorized to be repurchased (in shares)				5.0	4.0
Treasury Stock, Shares, Acquired			2.4
Total cost of shares repurchased			$ 181.5
Shares repurchased, excluds excise tax	$ 0.5	$ 0.9	$ 1.7
Dividends declared (in dollars per share)	$ 1.44	$ 3.08	$ 2.94
Total dividend payments	$ 66.7	$ 145.8	$ 144.3
Net earnings, net of tax, attributable to noncontrolling interests	56.7	49.2	49.9
Noncontrolling Interest [Member]
Accounting Policies [Line Items]
Net earnings, net of tax, attributable to noncontrolling interests		0.3	0.4
Interest And Other Non Operating Income	0.2
Subscription Arrangement [Member]
Accounting Policies [Line Items]
Unamortized Implementation Costs	$ 166.5	$ 110.8	$ 54.6
August 2021 Authorization
Accounting Policies [Line Items]
Treasury Stock, Shares, Acquired			2.0
Shares remaining authorized for repurchase (in shares)	0.0
August 2023 Authorization
Accounting Policies [Line Items]
Treasury Stock, Shares, Acquired	0.7	2.0	0.4
Total cost of shares repurchased	$ 37.5	$ 140.9
Shares remaining authorized for repurchase (in shares)	1.9