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Shareholders' Equity (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018
Statement [Line Items] |  |  |  |
Purchase for treasury | $ 500.0 | $ 4,400.0 | $ 4,150.0 |
Preferred stock, shares authorized (in shares) | 5,000,000.0 |  |  |
Shares issued (in shares) | 0 | 0 |  |
Shares held in employee trust (in shares) | 50,000,000.0 | 50,000,000.0 |  |
Employee benefit trust | $ 3,013.2 | $ 3,013.2 |  |
2018 Repurchase Program |  |  |  |
Statement [Line Items] |  |  |  |
Remaining authorized repurchase amount | $ 1,000.0 |  |  |
Stock repurchase program, authorized amount |  |  |  | $ 8,000.0

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