Revenue Recognition Revenue Recognition (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 774.8	$ 929.6	$ 896.9	$ 851.3	$ 848.0	$ 953.5	$ 945.5	$ 750.5	$ 3,452.6	$ 3,497.5	$ 3,763.8
Contract Receivable	$ 175.0				$ 177.7				175.0	177.7
Standard specialty products
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,123.2	1,125.6	1,039.7
Packaged and synthetic specialty products
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									230.9	256.8	260.7
Total specialty products
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,354.1	1,382.4	1,300.4
Fuel and fuel related products
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									1,864.7	1,885.7	2,115.7
Asphalt
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									233.8	229.4	347.7
Total fuel products
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 2,098.5	$ 2,115.1	$ 2,463.4