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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Aggregate purchase price | $ 2,303.2 | $ 382.3 | $ 44.7
Common Stock [Member] |  |  |
Class of Stock [Line Items] |  |  |
Treasury stock cancellation, Shares | 16,000,000 |  |
Stock Repurchase Program Board Authorized Repurchases [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares repurchased (in shares) | 22,300,000 | 7,200,000 | 1,300,000
Aggregate purchase price | $ 2,303.2 | $ 382.3 | $ 44.7
Average purchase price per share (in dollars per share) | $ 103.18 | $ 52.76 | $ 35.51
Remaining amount available for share repurchase | $ 894.6 |  |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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