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Restructuring Charges - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Restructuring Charges [Abstract]          
Restructuring charges $ 0.0 $ 6.2 $ 2.6 $ 6.2 $ 9.8
Stock-based compensation     11.7 $ 10.9 $ 5.6
Restructuring reserve $ 2.1   $ 2.1