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Stock-Based Compensation (Details) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 6,500,000 | $ 5,900,000 | $ 19,600,000 | $ 8,500,000
Tax benefit recognized |  |  |  | 9,300,000
2017 Target |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized stock-based compensation expense | 24,800,000 |  | 24,800,000 |
PRSU expense (benefit) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 700,000 | 1,000,000 | 2,200,000 | (7,100,000)
PRSU expense (benefit) | 2017 Aspirational Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum Adjusted EBITDA | $ 650,000,000 |  | $ 650,000,000 |
Target shares forfeited |  |  | 66.66% |
Outstanding (in shares) | 0.3 |  | 0.3 |
PRSU expense (benefit) | 2017 Aspirational Plan | 2018 Target |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Percentage of target shares to vest |  |  | 33.33% |
PRSU expense (benefit) | 2019 Aspirational Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 0 |  | $ 0 |
Grants in period |  |  | 1.6 |
PRSU expense (benefit) | 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 |  | $ 600,000,000 |
Award vesting percentage |  |  | 66.00% |
PRSU expense (benefit) | 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 |  | $ 650,000,000 |
Award vesting percentage |  |  | 100.00% |
PRSU expense (benefit) | 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 |  | $ 600,000,000 |
PRSU expense (benefit) | 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 |  | $ 600,000,000 |
Award vesting percentage |  |  | 66.00% |
PRSU expense (benefit) | 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 |  | $ 650,000,000 |
Award vesting percentage |  |  | 100.00% |
PRSU expense (benefit) | 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 |  | $ 600,000,000 |
PRSU expense (benefit) | 2019 Aspirational Plan | First Designated Period |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total unrecognized stock-based compensation expense | 93,900,000 |  | 93,900,000 |
Option expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 1,600,000 | 1,800,000 | 5,400,000 | 5,600,000
RSU/DSU expense |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | 4,200,000 | $ 3,100,000 | 12,000,000 | $ 10,000,000
Minimum | PRSU expense (benefit) | 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 |  | 600,000,000 |
Minimum | PRSU expense (benefit) | 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 |  | 600,000,000 |
Maximum | PRSU expense (benefit) | 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 |  | 650,000,000 |
Maximum | PRSU expense (benefit) | 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 |  | $ 650,000,000 |

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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 Unrecognized cost of unvested 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + 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 (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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 (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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 (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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