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Shareholders' Equity (Shares Repurchased Under Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price | $ 209.5 |  | $ 307.5 | $ 403.9 |  | $ 380.9 |  |
Excise tax accrual on share repurchases | $ 2.1 |  |  |  |  |  | $ 4.6 |
Stock Repurchase Program Board Authorized Repurchases |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares repurchased (in shares) | 1.6 |  |  | 3.7 |  |  | 4.0 | 7.2
Aggregate purchase price | $ 207.4 | [1] |  | $ 403.9 | [1] |  | $ 512.4 | $ 784.9
Average purchase price per share (in dollars per share) | $ 132.44 |  |  | $ 109.22 |  |  | $ 128.76 | $ 109.62
Remaining amount available for share repurchase | $ 672.0 |  |  |  |  |  | $ 672.0 |
[1] | (1) Excludes excise tax accrual imposed under the Inflation Reduction Act of $2.1 million and $4.6 million for the three and six months ended June 30, 2023, respectively.

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