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Stockholders' Deficit and Employee Benefit Plans (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 19, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 7.5 | $ 11.0 | $ 20.5 | $ 23.5
Series C Junior Participating Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Junior preferred stock reserved for issuance (in shares) | 20,000 |  |  |  |
Preferred stock par value (in dollars per share) | $ 1.00 |  |  |  |
Number of shares called by each right (in shares) | 0.0001 |  |  |  |
Right purchase price (in dollars per share) | $ 109.00 |  |  |  |
Preferred shares outstanding (in shares) |  | 0 |  | 0 |
Series A Preferred Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Preferred stock par value (in dollars per share) | $ 0.01 |  |  |  |
Series A Preferred Stock | Preferred Share Purchase Right |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Preferred share purchase right dividend | 1 |  |  |  |
Preferred shares issued (in shares) |  | 0 |  | 0 |
Related to vesting of stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 1.1 | 2.9 | $ 2.6 | 4.2
Related to vesting of RSUs |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |  |
Share-based compensation expense |  | $ 6.4 | $ 8.1 | $ 17.9 | $ 19.3

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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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