Subsequent Events (Details)	May 12, 2017 shares	Apr. 27, 2017 $ / shares	Apr. 19, 2017 location	Jan. 24, 2017 $ / shares	Nov. 15, 2016 $ / shares	Apr. 24, 2017 USD ($)
Subsequent Event [Line Items]
Dividend per share (usd per share)				$ 0.049	$ 0.049
Scenario, Forecast | Ashland
Subsequent Event [Line Items]
Authorized distribution (shares) | shares	170,000,000
Subsequent Event
Subsequent Event [Line Items]
Dividend per share (usd per share)		$ 0.049
Subsequent Event | Common Stock
Subsequent Event [Line Items]
Authorized amount of share repurchase | $						$ 150,000,000
Subsequent Event | Acquisition of Quick-Lube Locations
Subsequent Event [Line Items]
Number of locations acquired | location			9