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Shareholders' Equity - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 31, 2018 | Jul. 31, 2018 | May 31, 2018 | Apr. 30, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend declared (in dollars per share) |  |  |  |  |  |  |  | $ 0.70 | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.60 | $ 0.48 | $ 0.48 | $ 0.48 |  |
Length of repurchase program |  |  | 24 months |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |
Common stock, dividends, per share, cash paid (in dollars per share) |  | $ 0.60 |  | $ 0.60 | $ 0.60 | $ 0.48 | $ 0.48 |  |  | $ 0.60 |  |  |  | $ 0.48 |  |  |
Common stock repurchase program, authorized amount |  |  | $ 1,000,000,000.0 |  |  |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |
Treasury stock, shares, acquired (in shares) |  |  |  |  |  |  |  | 1,500,000.0 | 1,300,000.0 | 2,100,000.0 |  |  |  |  |  |  | 1,800,000.0
Treasury stock, value, acquired, cost method |  |  |  |  |  |  |  | $ 162,500,000 | $ 137,500,000 | $ 275,000,000 |  |  |  |  |  | $ 500,000,000 | $ 225,000,000
Remaining authorized repurchase amount |  |  |  |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |  | $ 700,000,000 |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, dividends, per share, cash paid (in dollars per share) | $ 0.70 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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