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v3.19.1

Shareholders' Equity (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 30, 2019 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Dividend declared (in dollars per share) |  |  |  | $ 0.70 | $ 0.70 | $ 0.6 | $ 0.60 |
Common stock, dividends, per share, cash paid (in dollars per share) |  |  | $ 0.6 | $ 0.7 |  | $ 0.6 |  |
Length of repurchase program |  | 24 months |  |  |  |  |  |
Common stock repurchase program, authorized amount |  | $ 1,000,000,000.0 |  |  |  |  |  |
Treasury stock, shares, acquired (in shares) |  |  |  | 0 |  |  |  | 2,800,000.0
Treasury stock, value, acquired, cost method |  |  |  |  |  | $ 275,039,000 |  | $ 300,000,000
Remaining authorized repurchase amount |  |  |  | $ 700,000,000 |  |  |  |
Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Common stock, dividends, per share, cash paid (in dollars per share) | $ 0.7 |  |  |  |  |  |  |

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- Definition Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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