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Earnings Per Share - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 14, 2018 | Mar. 02, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018
Earnings Per Share [Line Items] |  |  |  |  |  |
Stock options and equity instruments other than options granted in period (in shares) | 20,760 | 231,162,000 |  |  |  |
Exercise price (in dollars per share) | $ 40.74 | $ 41.97 |  |  |  |
Number of shares of common stock equal to one unit (in shares) |  |  | 1 |  |  |
Stock repurchased during period (in shares) |  |  |  | 475,175 |  | 545,282
Shares of common stock covering the tax withholding obligations (in shares) |  |  |  | 9,970 |  |
Stock repurchased during period, value |  |  |  | $ 17.3 |  | $ 19.7
Treasury stock acquired, weighted average cost per share (in dollars per share) |  |  |  | $ 35.70 |  | $ 36.06
Employee Stock Option [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Weighted average number of stock options excluded form computation of diluted earnings per share (in shares) |  |  |  | 135,535,000 | 70,782,000 |
Employee Stock Option [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Stock options granted in period (in shares) |  | 128,777,000 |  |  |  |
Performance Shares [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Equity instruments other than options granted in shares (in shares) |  | 58,078,000 |  |  |  |
Restricted Stock Units [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Equity instruments other than options granted in shares (in shares) |  | 44,307,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Vesting period (in months) | 12 months | 12 months |  |  |  |
Maximum [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Vesting period (in months) | 36 months | 36 months |  |  |  |
Deferred Compensation, Share-based Payments [Member] |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |
Number of units allocated to deferred compensation plan (in shares) |  |  |  | 8,570 |  | 8,570

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