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Incentive Compensation Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | $ 46.0 |  | $ 50.4 |  | $ 62.4 |
Tax benefit | 17.6 |  | 19.7 |  | 22.1 |
Stock options |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 3.7 |  | 5.4 |  | 6.7 |
Stock-settled awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 9.8 |  | 14.9 |  | 21.9 |
Cash-settled awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 1.5 |  | 3.9 |  | 5.7 |
Performance-based awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 29.6 |  | 24.5 |  | 23.3 |
Employee stock purchase plan |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 0.6 |  | 0.6 |  | 0.7 |
Other |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 0.8 | [1] | 1.1 | [1] | 4.1 | [1]
Time based cash awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Incentive compensation expense, Non share-based | 4.0 |  | 10.9 |  | 16.6 |
Performance based cash awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Incentive compensation expense, Non share-based | $ 18.3 |  | $ 18.9 |  | $ 22.0 |
[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 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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=27013229&loc=d3e301413-122809 Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + 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=32706628&loc=d3e11283-113907 + Details
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