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Sale of NAC Subsidiary (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Contract services $ 4.2   $ 3.5 $ 10.3 $ 10.6
Contract services costs 3.4   3.6 10.2 10.9
Gross profit (30.0)   36.6 (63.6) 83.5
Advanced technology costs 44.5   44.9 150.0 167.0
Selling, general and administrative 11.2   11.3 36.0 38.1
Operating income (53.3)   13.5 (135.0) (88.1)
Gain on sale of subsidiary   35.6   35.6 0
Segment, Discontinued Operations [Member]
          
Contract services 0   7.5 13.7 38.0
Contract services costs 0   6.6 11.8 32.9
Gross profit 0   0.9 1.9 5.1
Advanced technology costs 0   0.2 0 0.6
Selling, general and administrative 0   1.5 1.8 4.4
Operating income 0   (0.8) 0.1 0.1
Gain on sale of subsidiary 0   0 35.6 0
Income before income taxes 0   (0.8) 35.7 0.1
Provision for income taxes 0   (0.3) 14.0 0
Net income from discontinued operations $ 0   $ (0.5) $ 21.7 $ 0.1