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Stock-Based Compensation (Details) - USD ($) shares in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | $ 6,600,000 | $ 6,300,000
2017 Aspirational Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense |  | 0
PRSU expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 300,000 | 800,000
PRSU expense | 2017 Aspirational Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 650,000,000.0 |
Percentage of target shares forfeited | 33.33% |
PRSU expense | 2019 Aspirational Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | $ 0 |
Outstanding (in shares) | 1.6 |
PRSU expense | 2019 Aspirational Plan | 2018 Target |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting percentage | 50.00% |
PRSU expense | 2019 Aspirational Plan | 2018 Target | Adjust EBITDA is $600 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 600,000,000.0 |
Award vesting percentage | 66.00% |
PRSU expense | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA equals or exceeds $650 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 650,000,000.0 |
Award vesting percentage | 100.00% |
PRSU expense | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA is between $600.0 million and $650.0 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Award vesting percentage | 50.00% |
PRSU expense | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA is less than $600.0 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 600,000,000.0 |
PRSU expense | 2019 Aspirational Plan | 2017 Target | Adjust EBITDA is $600 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 600,000,000.0 |
Award vesting percentage | 66.00% |
PRSU expense | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA equals or exceeds $650 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 650,000,000.0 |
Award vesting percentage | 100.00% |
PRSU expense | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA is less than $600.0 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 600,000,000.0 |
PRSU expense | 2019 Aspirational Plan | First Designated Period |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total unrecognized stock-based compensation expense | 93,600,000 |
Option expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 1,200,000 | 1,900,000
RSU/DSU expense |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Total stock-based compensation expense | 5,100,000 | $ 3,600,000
Minimum | PRSU expense | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA is between $600.0 million and $650.0 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | 600,000,000.0 |
Minimum | PRSU expense | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA is between $600.0 million and $650.0 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | 600,000,000.0 |
Maximum | PRSU expense | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA is between $600.0 million and $650.0 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | 650,000,000.0 |
Maximum | PRSU expense | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA is between $600.0 million and $650.0 million |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Minimum Adjusted EBITDA | $ 650,000,000.0 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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