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Incentive Compensation Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | $ 50.4 |  | $ 62.4 |  | $ 66.8 |
Tax benefit | 19.7 |  | 22.1 |  | 22.1 |
Stock options |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 5.4 |  | 6.7 |  | 7.4 |
Stock-settled awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 14.9 |  | 21.9 |  | 32.7 |
Cash-settled awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 3.9 |  | 5.7 |  | 10.9 |
Performance-based awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 24.5 |  | 23.3 |  | 11.0 |
Employee stock purchase plan |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 0.6 |  | 0.7 |  | 0.5 |
Other |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 1.1 | [1] | 4.1 | [1] | 4.3 | [1]
Time based cash awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Incentive compensation expense, Non share-based | 10.9 |  | 16.6 |  | 12.8 |
Performance based cash awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Incentive compensation expense, Non share-based | $ 18.9 |  | $ 22.0 |  | $ 11.4 |
[1] | Represents charges recorded for severance expense related to stock-based compensation awards.

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- Definition Represents the expense recognized during the period arising from cash-based incentive compensation arrangements with employees, directors and certain consultants qualifying for treatment as employees. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph g(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=6793087&loc=d3e301413-122809 + Details
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- Definition Tax benefits realized from the exercise of stock options resulting in reductions in the entity's income taxes, which increases net cash provided by operating activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6576910&loc=d3e11283-113907 + Details
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