Discountinued Operations Discontinued Operations (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share	$ 0.00	$ 0.00	$ 0.00	$ (0.51)	$ 0.48	$ 0.31	$ 0.23	$ 0.73	$ (0.50)	$ 1.73	$ 1.48
Era Group [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Liability for Uncertain Tax Positions, Current	$ 10.1								$ 10.1
SES Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses										99.9
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax									1.0	18.6
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share										$ 0.90
Goodwill, Other Changes										8.0
SEI [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Divestiture of Businesses										15.1
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax									$ 0.1	$ 7.1
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share										$ 0.34