Fair Value of Financial Instruments (Details 3) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments in time and call deposits
Unrealized gains (losses) on available-for-sale securities	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Minimum
Investments in time and call deposits
Maturity of time deposits			1 month
Period of ability to redeem invested amounts on call deposits			31 days
Maximum
Investments in time and call deposits
Maturity of time deposits			12 months
Period of ability to redeem invested amounts on call deposits			95 days