Income Taxes - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Effective tax rate (percent)	27.80%	32.00%	28.00%	31.60%
Unrecognized tax benefits					$ 33,900,000
Unrecognized tax benefits adjusted					30,000,000
Amount of unrecognized tax benefits where significant change is reasonably possible					3,500,000
Accrued income tax interest and penalties					$ 8,600,000
Increase (decrease) in accrued income tax interest and penalties	$ 0		$ 0