Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Assets:
Derivatives assets	$ 0.3	$ 0.1
Liabilities:
Derivative liabilities	0.6	0.1
Fair Value, Measurements, Recurring
Assets:
Total assets	0.3	0.1
Liabilities:
Total liabilities	0.6	0.1
Fair Value, Measurements, Recurring | Commodity
Assets:
Derivatives assets	0.3	0.1
Liabilities:
Derivative liabilities	0.6	0.1
Fair Value, Measurements, Recurring | Level 1
Assets:
Total assets	0.0	0.0
Liabilities:
Total liabilities	0.0	0.0
Fair Value, Measurements, Recurring | Level 1 | Commodity
Assets:
Derivatives assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Fair Value, Measurements, Recurring | Level 2
Assets:
Total assets	0.0	0.1
Liabilities:
Total liabilities	0.1	0.1
Fair Value, Measurements, Recurring | Level 2 | Commodity
Assets:
Derivatives assets	0.0	0.1
Liabilities:
Derivative liabilities	0.1	0.1
Fair Value, Measurements, Recurring | Level 3
Assets:
Derivatives assets	0.3
Total assets	0.3	0.0
Liabilities:
Derivative liabilities	0.5
Total liabilities	0.5	0.0
Fair Value, Measurements, Recurring | Level 3 | Commodity
Assets:
Derivatives assets	0.3	0.0
Liabilities:
Derivative liabilities	$ 0.5	$ 0.0