Commitments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Future purchase obligations under Fluids supply agreement, aggregate	$ 135.1
Future purchase obligations under Fluids supply agreement, 2014	12.3
Future purchase obligations under Fluids supply agreement, 2015	11.2
Future purchase obligations under Fluids supply agreement, 2016	9.3
Future purchase obligations under Fluids supply agreement, 2017	9.3
Future purchase obligations under Fluids supply agreement, 2018	9.3
Future purchase obligations under Fluids supply agreement, after 2018 through 2029	83.7
Purchases under Fluids supply agreement	$ 22.0	$ 21.6	$ 21.3