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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2022 | Apr. 30, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |  |  |
Aggregate purchase price |  |  | $ 871.7 | $ 1,710.2 | $ 2,303.2
Excise tax accrual on share repurchases |  |  | $ 8.1 |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Treasury stock cancellation, Shares | 23,000,000 | 16,000,000 |  | 23,000,000 | 16,000,000
Stock Repurchase Program Board Authorized Repurchases [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares repurchased (in shares) |  |  | 6,400,000 | 15,600,000 | 22,300,000
Aggregate purchase price |  |  | $ 863.6 | $ 1,710.2 | $ 2,303.2
Average purchase price per share (in dollars per share) |  |  | $ 134.68 | $ 109.86 | $ 103.18
Remaining amount available for share repurchase |  |  | $ 320.8 |  |

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