Investment, Restructuring and Acquisition Activities - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments
Equity method investments, carrying value	$ 1.7	$ 1.7
Promissory notes	14.9	14.1
Corporate bonds	$ 14.4	$ 14.4
Retama Partners
Schedule of Equity Method Investments
Percentage of voting interests acquired	75.50%
Local government corporation bonds
Schedule of Equity Method Investments
Corporate bonds	$ 11.3

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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