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Goodwill and Other Intangible Assets (Details) ₪ in Millions, £ in Millions, $ in Millions |  | 2 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 04, 2016 GBP (£) | Aug. 04, 2016 USD ($) | Feb. 23, 2015 ILS (₪) | Feb. 23, 2015 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) | Jun. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2014 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  | $ 0.3 |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates |  |  |  |  |  | $ 13.7 | $ 2.4 |  |  |  |
Assets |  |  |  |  |  | 6,683.3 |  |  | $ 10,282.6 |  |
Goodwill |  |  |  |  |  |  |  | $ 24.1 | 24.1 | $ 24.1 | $ 23.8
Intangible Assets, Net (Excluding Goodwill) |  |  |  |  |  |  |  | $ 29.2 | 31.3 | $ 36.4 | $ 38.7
Liabilities |  |  |  |  |  | 2,881.9 |  |  | 5,914.6 |  |
Non-controlling interests |  |  |  |  |  | 149.2 |  |  | 454.8 |  |
Buzzmove [Member] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  | 70.90% |  |  |  |  |  |  |  |  |
Non-controlling interests |  | $ 2.6 |  |  |  | $ 3.3 |  |  | $ 0.0 |  |
Lowfares.com [Member] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates |  |  |  |  | $ 3.9 |  |  |  |  |  |
United States of America, Dollars | Buzzmove [Member] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates |  | 8.0 |  |  |  |  |  |  |  |  |
United Kingdom, Pounds | Buzzmove [Member] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates | £ 6.0 | 6.0 |  |  |  |  |  |  |  |  |
Common Stock | Israel, New Shekels | Cashboard [Member] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates | ₪ |  |  | ₪ 35.9 |  |  |  |  |  |  |  |
Common Stock | United States of America, Dollars | Cashboard [Member] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses and Interest in Affiliates |  |  |  | $ 8.9 |  |  |  |  |  |  |
Cashboard [Member] |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Assets |  | 11.7 |  | 5.5 |  |  |  |  |  |  |
Goodwill |  |  |  | 0.3 |  |  |  |  |  |  |
Intangible Assets, Net (Excluding Goodwill) |  | 9.0 |  | 2.8 |  |  |  |  |  |  |
Liabilities |  | $ 0.1 |  | $ 1.2 |  |  |  |  |  |  |

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