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Investment in Other Companies (Details) - Trip Linhas Aereas $ in Millions | 12 Months Ended
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Dec. 31, 2014 USD ($)
Investments in other companies |
Company's investment balance | $ 42.0
Gain (loss) on equity method investments | $ 24.9
Common Stock |
Investments in other companies |
Annual rate of return used to calculate the put option price (as a percent) | 20.00%

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