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Sale of NAC Subsidiary (Details) (USD $)
In Millions, 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
Contract services                 $ 13.4 $ 14.3 $ 138.1
Contract services costs                 13.6 14.2 134.3
Gross profit (31.3) (30.0) (46.9) 13.3 45.9 36.6 10.2 36.7 (94.9) 129.4 75.4
Advanced technology costs 36.1 44.5 46.2 59.3 1,146.2 44.9 85.4 36.7 186.1 1,313.2 271.6
Selling, general and administrative 10.8 11.2 11.9 12.9 12.2 11.3 13.2 13.6 46.8 50.3 56.4
Operating income (95.7) (53.3) (68.0) (13.7) (1,066.2) 13.5 (81.6) (20.0) (230.7) (1,154.3) (248.9)
Gain on sale of subsidiary       35.6         35.6 0 0
Provision for income taxes                 11.0    
Segment, Discontinued Operations [Member]
                      
Contract services                 13.7 56.0 71.0
Contract services costs                 11.8 47.4 62.2
Gross profit                 1.9 8.6 8.8
Advanced technology costs                 0 0.8 1.6
Selling, general and administrative                 1.8 5.8 5.7
Operating income                 0.1 2.0 1.5
Gain on sale of subsidiary                 35.6 0 0
Income before income taxes                 35.7 2.0 1.5
Provision for income taxes                 11.0 0.8 0.8
Net income from discontinued operations                 $ 24.7 $ 1.2 $ 0.7