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Capital Stock - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Oct. 23, 2018 | Jul. 31, 2018 | Feb. 28, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |  |  |  |  |
Treasury stock |  |  |  |  | 42,080,250 | 42,080,250 | 14,935,926
Remaining shares available for repurchase |  |  |  |  | 22,900,000 | 22,900,000 |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Incremental shares authorized |  |  | 20,000,000 | 25,000,000 |  |  |
Shares authorized for repurchase |  |  | 30,100,000 |  |  |  |
Shares repurchased |  |  |  |  |  | 27,100,000 |
Treasury stock repurchases (in usd) |  |  |  |  |  | $ 644.2 |
Dividends (in usd per share) |  |  |  |  | $ 0.06 |  |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Shares repurchased |  | 2,800,000 |  |  |  |  |
Treasury stock repurchases (in usd) |  | $ 65.6 |  |  |  |  |
Treasury stock settled | 2,700,000 |  |  |  |  |  |
Dividends (in usd per share) | $ 0.07 |  |  |  |  |  |

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