Goodwill and Other Intangible Assets (Details) ₪ in Millions, $ in Millions	2 Months Ended		3 Months Ended	6 Months Ended
	Feb. 23, 2015 ILS (₪)	Feb. 23, 2015 USD ($)	Mar. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to Acquire Businesses and Interest in Affiliates				$ 8.1	$ 2.4
Assets				7,065.6		$ 10,282.6
Goodwill			$ 24.1	24.1	24.1	24.1	$ 24.1	$ 23.8
Intangible Assets, Net (Excluding Goodwill)			32.2	29.2	$ 36.4	31.3	$ 39.0	$ 38.7
Liabilities				$ 2,966.2		$ 5,914.6
Lowfares.com [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Payments to Acquire Businesses and Interest in Affiliates			$ 3.9
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		5.5
Goodwill		0.3
Intangible Assets, Net (Excluding Goodwill)		2.8
Liabilities		$ 1.2