Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Deposit received on sale of DPLER	$ 0.0	$ 75.5
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	49.2	0.0	$ 0.0
Accounts receivable, net		31.0
Property, plant & equipment, net		1.1
Intangible assets, net		28.1
Other assets		2.0
Total assets of the disposal group classified as held for sale in the balance sheets		62.2
Accounts payable		0.8
Other liabilities		0.8
Total liabilities of the disposal group classified as held for sale in the balance sheets		1.6
Revenues	0.0	340.9	533.6
Cost of revenues	0.0	(307.0)	(493.0)
Operating expenses	(0.7)	(22.5)	(34.0)
Goodwill impairment	0.0	0.0	(135.8)
Profit / (loss) of discontinued operations before income taxes	(0.7)	11.4	(129.2)
Income tax expense / (benefit)	19.2	(1.0)	2.6
Net income / (loss) from discontinued operations	29.3	12.4	(131.8)
Cash provided by (used in) operating activities, discontinued operations	(0.7)	35.8	29.6
Cash provided by (used in) investing activities, discontinued operations	75.5	$ 0.5	$ (2.2)
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