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Share-Based Compensation (Details) |  | 12 Months Ended
--- | --- | ---
Nov. 01, 2017 USD ($) trading_day agreement $ / shares | Dec. 31, 2018 USD ($) plan shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares right to receive cash payment on vesting equal to fair market value is received per award (in shares) | shares |  | 1 |  |
Vesting period |  | 3 years |  |
Number of defined-contribution 401(k) plans | plan |  | 2 |  |
Matching contributions made by the company |  | $ 9,000,000 | $ 9,000,000 | $ 8,000,000
2018 CEO Performance Award | Performance awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of performance award agreements entered into | agreement | 2 |  |  |
Target value of awards granted |  | 1,500,000 |  |
Maximum cash payment | $ 10,000,000 |  |  |
Period for determination of cash payment value | trading_day | 30 |  |  |
Maximum price per share to trigger maximum cash payment (in dollars per share) | $ / shares | $ 60 |  |  |
Outstanding liability |  | 2,000,000 |  |
Former CEO Performance Award | Performance awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Outstanding liability |  | $ 0 |  |
Vesting Year One |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  | 33.33% |  |
Vesting Year Two |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  | 33.33% |  |
Vesting Year Three |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  | 33.33% |  |

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