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Stockholders' Equity - Common Stock Dividends and Reconciliation of Outstanding Common Shares (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2022 | Aug. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Jan. 31, 2022 | Jun. 30, 2021 | Feb. 29, 2020 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Aug. 16, 2022
Common stock share repurchase disclosures |  |  |  |  |  |  |  |  |  |  |  |
Amount of forward contract recorded in additional paid in capital |  |  |  |  |  |  |  | $ (8.9) |  | $ 33.9 |  |
Common stock |  |  |  |  |  |  |  |  |  |  |  |
Common Stock Dividends |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  |  |  |  |  | $ 0.64 | $ 0.63 | $ 1.92 | $ 1.80 |
Reconciliation of Outstanding Common Shares |  |  |  |  |  |  |  |  |  |  |  |
Outstanding shares at beginning of period |  |  |  |  | 261.7 |  |  | 249.9 | 269.0 | 261.7 | 273.3 |
Shares issued |  |  |  |  |  |  |  | 1.0 | 0.3 | 3.3 | 2.4 |
Treasury stock acquired |  |  |  |  |  |  |  | (6.0) | (3.2) | (20.1) | (9.6) |
Outstanding shares at end of period | 244.9 |  | 249.9 |  |  | 269.0 |  | 244.9 | 266.1 | 244.9 | 266.1 |
Common stock share repurchase disclosures |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, maximum authorized amount (in dollars) |  |  |  |  | $ 1,600.0 | $ 1,200.0 | $ 900.0 |  |  |  |  |
Common stock | March 2022 Accelerated Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
Common stock share repurchase disclosures |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, maximum authorized amount (in dollars) |  |  |  | $ 700.0 |  |  |  |  |  |  |  |
Number of shares repurchased |  |  | 1.4 | 8.5 |  |  |  |  |  |  |  |
Initial cost of shares repurchased |  |  |  | $ 560.0 |  |  |  |  |  |  |  |
Amount of forward contract recorded in additional paid in capital |  |  |  | $ 140.0 |  |  |  |  |  |  |  |
Volume-weighted average price of our common stock |  |  | $ 70.53 |  |  |  |  |  |  |  |  |
Common stock | August 2022 Accelerated Share Repurchase Program |  |  |  |  |  |  |  |  |  |  |  |
Common stock share repurchase disclosures |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, maximum authorized amount (in dollars) |  | $ 400.0 |  |  |  |  |  |  |  |  |  |
Number of shares repurchased | 1.2 | 4.1 |  |  |  |  |  |  |  |  |  |
Initial cost of shares repurchased |  |  |  |  |  |  |  |  |  |  |  | $ 320.0
Volume-weighted average price of our common stock | $ 76.48 |  |  |  |  |  |  |  |  |  |  |

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