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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
--- | --- | --- | ---
Feb. 29, 2020 | Nov. 30, 2018 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Common Stock Dividends |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  | $ 0.56 | $ 0.54 | $ 1.12 | $ 1.08
Reconciliation of Outstanding Common Shares |  |  |  |  |  |
Outstanding shares at beginning of period |  |  | 273.4 | 278.2 | 276.6 | 279.5
Shares issued |  |  | 0.6 | 0.4 | 1.8 | 2.2
Treasury stock acquired |  |  |  |  | (4.4) | (3.1)
Outstanding shares at end of period |  |  | 274.0 | 278.6 | 274.0 | 278.6
Common stock share repurchase disclosures |  |  |  |  |  |
Share repurchase program, maximum authorized amount (in dollars) | $ 900.0 | $ 500.0 |  |  |  |

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