Fair Value Measurements - Trading Securities (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015	Aug. 13, 2015
Sphere 3D
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of shares held	$ 3.3	$ 3.3
RDX Storage
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total consideration from sale of business			$ 6.0
Gain on sale of business	4.8	4.8
Gain (loss) on shares acquired through disposition of business	$ (0.3)	$ (0.3)
RDX Storage | Sphere 3D
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Share received as consideration	1.5	1.5	1.5