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Shareholders' Equity (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2019 | Sep. 30, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | Oct. 31, 2018 | Jul. 31, 2018 | May 31, 2018 | Apr. 30, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared (in dollars per share) |  | $ 0.78 |  |  |  |  |  |  | $ 0.78 | $ 0.70 | $ 0.70 | $ 0.70 | $ 0.7 | $ 0.60 | $ 0.60 | $ 0.60 | $ 2.18 | $ 1.90 |
Common stock, dividends, per share, cash paid (in dollars per share) |  |  | $ 0.70 | $ 0.70 | $ 0.7 | $ 0.60 |  | $ 0.60 |  |  | $ 0.70 |  |  |  | $ 0.60 |  |  |  |
Dividends declared |  | $ 163,500,000 |  |  |  |  |  |  | $ 163,500,000 |  |  |  | $ 146,800,000 |  |  |  | $ 163,500,000 | $ 146,800,000 |
Length of repurchase program |  |  |  |  |  |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |
Common stock repurchase program, authorized amount |  |  |  |  |  |  | $ 1,000,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares, acquired (in shares) |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  | 0 |  | 2,800,000
Treasury stock, value, acquired, cost method |  |  |  |  |  |  |  |  |  |  |  |  | $ 162,540,000 |  |  |  |  | $ 575,039,000 | $ 300,000,000.0
Remaining authorized repurchase amount |  | $ 700,000,000.0 |  |  |  |  |  |  | $ 700,000,000.0 |  |  |  |  |  |  |  | $ 700,000,000.0 |  |
Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends, per share, cash paid (in dollars per share) | $ 0.78 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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