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Stockholders' Equity - Common Stock Dividends and Reconciliation of Outstanding Common Shares (Details) - Common stock - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Feb. 29, 2020 | Nov. 30, 2018 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Common Stock Dividends |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  | $ 0.61 | $ 0.56 | $ 1.17 | $ 1.12
Reconciliation of Outstanding Common Shares |  |  |  |  |  |  |
Outstanding shares at beginning of period |  |  |  | 272.5 | 273.4 | 273.3 | 276.6
Shares issued |  |  |  | 0.7 | 0.6 | 2.1 | 1.8
Treasury stock acquired |  |  |  | (4.2) |  | (6.4) | (4.4)
Outstanding shares at end of period | 269.0 |  |  | 269.0 | 274.0 | 269.0 | 274.0
Common stock share repurchase disclosures |  |  |  |  |  |  |
Share repurchase program, maximum authorized amount (in dollars) | $ 1,200.0 | $ 900.0 | $ 500.0 |  |  |  |

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