Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	28.90%	26.70%
Accrued interest	$ 4,000,000
Accrued penalties	0
Tax benefit from subsidiary	$ 1,000,000		$ 13,000,000