Annual report pursuant to Section 13 and 15(d)

Available-For-Sale ("AFS") Securities (Details)

v3.3.1.900
Available-For-Sale ("AFS") Securities (Details) - Common Stock - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]      
Proceeds from sale of available for sale investments $ 3.3 $ 0.6 $ 6.3
Gain on sale of available-for-sale securities   $ 0.1 $ 0.1