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Share-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 21, 2015 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2012 | May 31, 2011
Share-Based Compensation [Abstract] |  |  |  |  |  |
Unrecognized stock-based compensation expense |  | $ 21.2 |  |  |  |
Number of years expected to recognize stock-based compensation |  | 17 months |  |  |  |
Share-based payment arrangement, expense |  | $ 28.0 | $ 31.0 | $ 28.0 |  |
Share-based compensation arrangement by Share-based payment award, number of shares authorized (in shares) |  | 10.5 |  |  |  |
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in shares) | 7.5 |  |  |  |  |
CSPP offering period |  | 6 months |  |  |  |
Shares issued following the director's departure from the board |  | six months and one day |  |  |  |
Outstanding voting securities |  | 50.00% |  |  |  |
Exercise price of purchasing rights as percentage of fair market value per share in case of acquisition |  | 85.00% |  |  |  |
Incentive Compensation Plan 2011 |  |  |  |  |  |
Share-Based Compensation [Abstract] |  |  |  |  |  |
Share-based compensation arrangement by Share-based payment award, number of shares authorized (in shares) |  |  |  |  | 15.0 |
Restricted Stock Unit Activity Under 2011 Plan |  |  |  |  |  |
Share-Based Compensation [Abstract] |  |  |  |  |  |
unvested restricted stock units (in shares) |  | 2.1 | 2.0 |  |  |
Restricted stock unit activity granted, weighted average grant date fair value (in dollars per share) |  | $ 17.96 | $ 17.27 | $ 20.62 |  |
Crewmember Stock Purchase Plan 2011 |  |  |  |  |  |
Share-Based Compensation [Abstract] |  |  |  |  |  |
Share-based compensation arrangement by Share-based payment award, number of shares authorized (in shares) |  | 17.5 |  |  |  | 8.0
Employees contribution towards purchase of common stock |  | 10.00% |  |  |  |
Purchase price discount based upon the stock price |  | 15.00% |  |  |  |
Employee stock purchase plan (ESPP), expense |  | $ 6.0 | $ 9.0 | $ 9.0 |  |
Stock issued under crewmember stock purchase plan (in shares) |  | 4.1 | 3.2 | 3.2 |  |
Share-based compensation arrangement by share-based payment award, per share weighted average price of shares purchased (in dollars per share) |  | $ 8.94 | $ 16.06 | $ 15.21 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-Based Compensation [Abstract] |  |  |  |  |  |
unvested restricted stock units (in shares) |  | 2.4 |  |  |  |
Share-based compensation aggregate intrinsic value, vested |  | $ 18.0 | $ 15.0 | $ 16.0 |  |
Restricted Stock Units (RSUs) | Restricted Stock Unit Activity Under 2011 Plan |  |  |  |  |  |
Share-Based Compensation [Abstract] |  |  |  |  |  |
Share-based compensation arrangement by Share-based payment award, award vesting period |  | 3 years |  |  |  |
Deferred Stock Units (DSU's) |  |  |  |  |  |
Share-Based Compensation [Abstract] |  |  |  |  |  |
Minimum vesting period |  | 1 year |  |  |  |
Maximum vesting period |  | 3 years |  |  |  |
Crewmember Stock Purchase Plan 2011 |  |  |  |  |  |
Share-Based Compensation [Abstract] |  |  |  |  |  |
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in shares) | 15.0 |  |  |  |  |

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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=120381028&loc=d3e5070-113901 + Details
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- Definition Discount rate from fair value on purchase date that participants pay for shares. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Per share weighted-average price paid for shares purchased on open market for issuance under share-based payment arrangement. + 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 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 + Details
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