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Shareholders' Equity (Shares Repurchased Under Share Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Class of Stock [Line Items] |  |
Aggregate purchase price | $ 306.1 | $ 80.0
Stock Repurchase Program Board Authorized Repurchases [Member] |  |
Class of Stock [Line Items] |  |
Shares repurchased (in shares) | 3.8 | 2.5
Aggregate purchase price | $ 306.1 | $ 80.0
Average purchase price per share (in dollars per share) | $ 79.76 | $ 31.95
Remaining amount available for share repurchase | $ 891.7 |

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- Definition Amount remaining of a stock repurchase plan authorized. + References No definition available. + Details
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