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Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | $ 72.6 | $ 56.7 | $ 46.0
Tax benefit |  | 26.3 | 20.6 | 17.6
Employee Stock Option |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 1.0 | 2.1 | 3.7
Stock-settled awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 11.6 | 10.0 | 9.8
Cash-settled awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 0.7 | 0.6 | 1.5
Performance-based awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 57.7 | 42.2 | 29.6
Employee stock purchase plan |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 0.7 | 0.6 | 0.6
Other |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense | [1] | $ 0.9 | $ 1.2 | $ 0.8
[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 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 S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: 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 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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