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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 | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jul. 15, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 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) |  | 7.5 |  | 0.0 |  | 11.3 | 2.5 |
Aggregate purchase price |  | $ 736.1 |  | $ 0.0 |  | $ 1,042.2 | $ 80.0 |
Average purchase price per share (in dollars per share) |  | $ 98.17 |  | $ 0 |  | $ 91.94 | $ 31.95 |
Remaining amount available for share repurchase |  | $ 155.5 |  |  |  | $ 155.5 |  |
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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