| **Share-Based Payments - Weighted-average Assumptions (Details)**                          | 12 Months Ended  |
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| Stock Options [Member]                                                                     |             |   |   |
| **Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Options** |             |   |   |
| Expected volatility (percent)                                                              | 37.20%           | 39.50% | 40.30% |
| Risk-free interest rate (percent)                                                          | 1.60%            | 1.90% | 2.20% |
| Expected life (years)                                                                      | 7 years 6 months | 7 years 8 months 12 days | 7 years 2 months |
| Dividend yield (percent)                                                                   | 2.10%            | 2.10% | 2.10% |
| Stock Appreciation Rights (SARs) [Member]                                                  |             |   |   |
| **Schedule of Weighted Average Assumptions Used to Determine Fair Value of Stock Options** |             |   |   |
| Expected volatility (percent)                                                              | 25.90%           | 30.70% |   |
| Risk-free interest rate (percent)                                                          | 1.90%            | 2.10% |   |
| Expected life (years)                                                                      | 5 years 3 months | 6 years 3 months 12 days |   |
| Dividend yield (percent)                                                                   | 0.00%            | 0.00% |   |

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| - References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| - Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
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| - Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Weighted average expected volatility rate of share-based compensation awards.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
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| - Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.
+ References
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