Investments in Other Entities - Home Service Provider (Details) - Connected Home Service Provider - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Apr. 20, 2016	Apr. 15, 2015	Mar. 31, 2017	Dec. 31, 2016
Other Assets
Schedule of Cost-method Investments [Line Items]
Cost method investment			$ 0.6	$ 0.6
Variable Interest Entity, Not Primary Beneficiary
Schedule of Cost-method Investments [Line Items]
Ownership interest in cost method investment	14.30%	12.60%	12.40%
Cost method investment			$ 0.4
Variable Interest Entity, Not Primary Beneficiary | Series A Convertible Preferred Membership Units
Schedule of Cost-method Investments [Line Items]
Cost method investment, shares			20,000
Variable Interest Entity, Not Primary Beneficiary | Series B Convertible Preferred Membership Units
Schedule of Cost-method Investments [Line Items]
Cost method investment, shares			2,667
Variable Interest Entity, Not Primary Beneficiary | Series B-1 Convertible Preferred Membership Units
Schedule of Cost-method Investments [Line Items]
Cost method investment, shares	6,904	2,333
Cost method investment, share price	$ 20.19	$ 23.31
Cost method investment, original cost	$ 0.1	$ 0.1