Transactions with Major Customers and Concentration of Credit Risk - Schedule of Revenues from Third Party Customers (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Concentration Risk [Line Items]
Revenues	$ 75.6	$ 67.9	$ 71.1	$ 76.7	$ 84.6	$ 96.2	$ 79.8	$ 65.9	$ 291.3	$ 326.5	$ 250.3
Customer A
Concentration Risk [Line Items]
Revenues									17.9	26.2	22.2
Customer B
Concentration Risk [Line Items]
Revenues									42.7	39.5	39.4
Customer C
Concentration Risk [Line Items]
Revenues									72.9	85.7	44.6
Customer D
Concentration Risk [Line Items]
Revenues									$ 38.2	$ 44.7	$ 20.2