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Stock Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | $ 84.5 | $ 88.0 | $ 72.6
Tax benefit |  | 30.4 | 32.1 | 26.3
Employee Stock Option |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 0.0 | 0.2 | 1.0
Stock-settled awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 20.5 | 16.0 | 11.6
Cash-settled awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 1.0 | 0.9 | 0.7
Performance-based awards |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 61.5 | 69.4 | 57.7
Employee stock purchase plan |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense |  | 1.0 | 0.7 | 0.7
Other |  |  |  |
Stock-based Payment Award |  |  |  |
Stock-based compensation expense | [1] | $ 0.5 | $ 0.8 | $ 0.9
[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=96867065&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=96867065&loc=d3e5070-113901 + 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=96864182&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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