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Shareholders' Equity (Shares Repurchased Under Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 24, 2024 | Mar. 31, 2024 | Mar. 31, 2023
Class of Stock [Line Items] |  |  |  |
Aggregate purchase price |  |  | $ 38.8 | $ 307.5
Excise tax accrual on share repurchases |  |  | $ 0.1 | $ 2.5
Stock Repurchase Program Board Authorized Repurchases |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares repurchased (in shares) |  |  | 0.2 | 2.4
Aggregate purchase price | [1] |  | $ 38.7 | $ 305.0
Average purchase price per share (in dollars per share) |  |  | $ 158.40 | $ 126.37
Remaining amount available for share repurchase |  |  | $ 282.1 |
Stock Repurchase Program Board Authorized Repurchases | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares repurchased (in shares) |  | 1.4 |  |
Aggregate purchase price |  | $ 211.3 |  |
Average purchase price per share (in dollars per share) |  | $ 155.74 |  |
Increase in share repurchase authorization |  | $ 1,000.0 |  |
[1] | (1) Excludes excise taxes imposed under the Inflation Reduction Act of $0.1 million and $2.5 million for the three months ended March 31, 2024, and March 31, 2023, respectively.

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