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Stockholders’ Equity - Employee Stock Purchase Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Stock Compensation Plans |  |  |
Number of shares issued | 233,712 | 157,277 | 126,648
Stock compensation expense | $ 148.2 | $ 133.1 | $ 96.2
Employee Stock |  |  |
Stock Compensation Plans |  |  |
Employment period for eligibility to participate in the plan | 1 month |  |
Number of shares issued | 233,712 | 157,277 | 126,648
Stock compensation expense | $ 3.7 | $ 3.2 | $ 2.4
Remaining shares available | 693,521 |  |
Employee Stock | Minimum |  |  |
Stock Compensation Plans |  |  |
Number of employee working hours per week for eligibility to participate in the plan | 20 hours |  |

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- Definition Represents the period of employ after which an employee who works a minimum of 20 hours per week can participate under the plan. + References No definition available. + Details
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- Definition Represents the number of hours that a part-time or regular full-time employee must work per week to participate under the plan. + 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 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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