Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues		$ 0.0
Cost of revenues		0.0
Operating expenses		(0.7)
(Loss) / income from discontinued operations before income taxes	$ 0.0	(0.7)
Gain from disposal of discontinued operations	0.0	49.2
Income tax expense / (benefit) for discontinued operations	0.0	18.9
Discontinued operations	$ 0.0	29.6
Cash flows from operating activities for discontinued operations		(0.7)
Cash flows from investing activities for discontinued operations		$ 75.5
Dpler [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deposit received on sale of DPLER			$ 75.5