Intangible Assets and Goodwill (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	$ 4.3		$ 4.3
Accumulated amortization	(0.3)		(0.1)
Intangible assets, net	4.0		4.2
Amortization expense	0.2	$ 1.9
Intangible Assets, Amortization Expense, Remainder of 2016	0.5
Intangible Assets, Amortization Expense, 2017	0.7
Intangible Assets, Amortization Expense, 2018	0.7
Intangible Assets, Amortization Expense, 2019	0.7
Intangible Assets, Amortization Expense, 2020	0.7
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Cost	4.3		4.3
Accumulated amortization	(0.3)		(0.1)
Intangible assets, net	$ 4.0		$ 4.2