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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount |  | $ 8.0 | $ 5.0 | $ 3.0 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 25.3 |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition |  | 2 years |  |  |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 31.0 | $ 28.0 | $ 29.0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 7.5 |  |  |  |  |
Period For Shares Issuance Following Departure Of Director |  | six months and one day |  |  |  |
Period For Successive Overlapping |  | 6 months |  |  |  |
Percentage Of Voting Interests To Be Acquired For Business Combination Minimum |  | 50.00% |  |  |  |
Exercise Price Of Purchasing Rights As Percentage Of Fair Market Value In Case Of Acquisition |  | 85.00% |  |  |  |
Incentive Compensation Plan Two Thousand Eleven [Member] |  |  |  |  |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  | 15.0 |
Restricted Stock Unit Activity Under 2011 Plan [Member] |  |  |  |  |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Nonvested shares, beginning balance |  | 1.7 |  |  |  |
Restricted stock unit activity granted, shares |  | 1.3 |  |  |  |
Restricted stock unit activity granted, weighted average grant date fair value |  | $ 17.27 | $ 20.62 | $ 19.76 |  |
Restricted stock unit activity vested, shares |  | (0.9) |  |  |  |
Restricted stock unit activity vested, weighted average grant date fair value |  | $ 20.29 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period |  | (0.1) |  |  |  |
Restricted stock unit activity forfeited, weighted average grant date fair value |  | $ 18.99 |  |  |  |
Nonvested shares, ending balance |  | 2.0 | 1.7 |  |  |
Nonvested, weighted average grant date fair value, ending balance |  | $ 18.59 | $ 20.59 |  |  |
Crewmember Stock Purchase Plan 2011 [Member] |  |  |  |  |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized |  |  |  |  |  | 8.0
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Subscription Rate |  | 10.00% |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Discount from Market Price, Purchase Date |  | 15.00% |  |  |  |
Employee Stock Purchase Plan (ESPP), Expense |  | $ 9.0 | $ 9.0 | $ 8.0 |  |
Stock Issued During Period, Shares, Employee Stock Purchase Plans |  | 3.2 | 3.2 | 2.5 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased |  | $ 16.06 | $ 15.21 | $ 17.46 |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Vested |  | $ 15.0 | $ 16.0 | $ 20.0 |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Nonvested shares, ending balance |  | 2.5 |  |  |  |
Restricted Stock Units (RSUs) [Member] | Restricted Stock Unit Activity Under 2011 Plan [Member] |  |  |  |  |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 3 years |  |  |  |
Deferred Stock Units (DSU's) [Member] |  |  |  |  |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Award Restricted Stock Units Vesting Period Minimum |  | 1 year |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Award Restricted Stock Units Vesting Period Maximum |  | 3 years |  |  |  |
Crewmember Stock Purchase Plan 2011 [Member] |  |  |  |  |  |
Summary of restricted stock unit activity |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized | 15.0 |  |  |  |  |

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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=116856206&loc=d3e5070-113901 + Details
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