| CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND OTHER COMPREHENSIVE INCOME (LOSS) (Parenthetical) | 12 Months Ended | 
|---|---|
| Dec. 31, 2017  $ / shares | |
| Cash dividends (in dollars per share) | $ 1.56 | 
| Common Stock Repurchase Program | |
| Treasury stock purchased under the share repurchase program (in dollars per share) | $ 143.88 | 
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Details 
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