Acquisition (Details) - Asset Purchase Agreement - USD ($) $ in Millions		12 Months Ended
	Nov. 06, 2013	Dec. 31, 2013
Purchase price allocated to major classes of assets
Spare parts inventory	$ 3.4
Accounts receivables	1.7
Identifiable intangible assets	1.2
Goodwill	0.3
J.T. Power
Acquisitions [Line Items]
Value of certain assets purchased	5.6	$ 5.6
Cash payment for certain asset purchases	4.5	4.5
Cash received	0.4	$ 0.4
J.T. Power | Consignment agreement with guarantee
Acquisitions [Line Items]
Amount owed to the entity related to the minimum guarantee, which is deducted from payment made in cash	$ 0.7