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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Oct. 20, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 879.2 | $ 736.1 | $ 306.1 |  | $ 80.0 |  |  |
Shares of treasury stock retired | 16.0 |  |  |  |  |  |  |  |
Stock Repurchase Program Board Authorized Repurchases [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) |  | 7.9 |  |  | 0.0 |  | 19.2 | 2.5 |
Aggregate purchase price |  | $ 879.2 |  |  | $ 0.0 |  | $ 1,921.4 | $ 80.0 |
Average purchase price per share (in dollars per share) |  | $ 111.96 |  |  | $ 0 |  | $ 100.13 | $ 31.95 |
Remaining amount available for share repurchase |  | $ 276.3 |  |  |  |  | $ 276.3 |  |
Stock Repurchase Program Board Authorized Repurchases [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  | $ 1,000.0

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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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