Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Litigation Settlement, Amount Awarded from Other Party		$ 12.8
Future purchase obligations under Fluids supply agreement, aggregate	$ 104.0
Future purchase obligations under Fluids supply agreement, 2014	9.5
Future purchase obligations under Fluids supply agreement, 2015	9.5
Future purchase obligations under Fluids supply agreement, 2016	9.5
Future purchase obligations under Fluids supply agreement, 2017	9.5
Future purchase obligations under Fluids supply agreement, 2018	9.5
Future purchase obligations under Fluids supply agreement, after 2018 through 2029	56.5
Purchases under Fluids supply agreement	$ 18.0	$ 16.1	$ 13.3