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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 |  |  |  |

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