Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 4.3		$ 4.3		$ 4.3
Accumulated amortization	(0.7)		(0.7)		(0.1)
Intangible assets, net	3.6		3.6		4.2
Amortization expense	0.2	$ 1.8	0.6	$ 5.6
Amortization expense, remainder of 2016	0.1		0.1
Amortization expense, 2017	0.7		0.7
Amortization expense, 2018	0.7		0.7
Amortization expense, 2019	0.7		0.7
Amortization expense, 2020	0.7		0.7
Goodwill	3.8		3.8		3.8
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	4.3		4.3		4.3
Accumulated amortization	(0.7)		(0.7)		(0.1)
Intangible assets, net	$ 3.6		$ 3.6		$ 4.2