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Stockholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stockholders' equity |  |  |
Common stock, shares authorized | 153.0 | 153.0 |
Share repurchase activity |  |  |
Shares Repurchase (in shares) | 0.1 | 0.6 | 0.7
Preferred Stock [Member] |  |  |
Stockholders' equity |  |  |
Preferred stock, shares authorized | 5.0 |  |
Common Stock [Member] |  |  |
Stockholders' equity |  |  |
Maximum number of shares yet to be repurchased | 2.2 |  |
Share repurchase activity |  |  |
Shares Repurchase (in shares) | 0.1 | 0.6 | 0.7
Average Price (in dollars per share) | $ 184.89 | $ 107.44 | $ 83.63
Voting Common Stock [Member] |  |  |
Stockholders' equity |  |  |
Common stock, shares authorized | 150.0 |  |
Class B Non-Voting Common Stock [Member] |  |  |
Stockholders' equity |  |  |
Common stock, shares authorized | 3.0 |  |

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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