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Recent Accounting Pronouncements (Details) - USD ($) $ in Millions | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |
Stockholders' equity | $ 9,879.7 | $ 9,591.3 |  | $ 9,491.9 | $ 8,351.0 | $ 8,137.4 | $ 7,738.5
Retained earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' equity | $ 8,168.7 | $ 8,003.1 |  | 7,818.0 | $ 6,771.0 | $ 6,569.4 | $ 6,247.7
Cumulative Effect, Period Of Adoption, Adjustment |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' equity |  |  |  | (1.7) |  |  |
Cumulative Effect, Period Of Adoption, Adjustment | Retained earnings |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' equity |  |  | $ (1.7) | $ (1.7) |  |  |

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