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Restructuring Charges (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Restructuring Cost and Reserve [Line Items]        
Stock-based compensation     $ 10.9 $ 5.8
Restructuring reserve 2.5   2.5  
Restructuring charges 6.2 [1] 0 [1] 6.2 [1] 0 [1]
Restructuring Charges
       
Restructuring Cost and Reserve [Line Items]        
Stock-based compensation     $ 3.5 [1]  
[1] Restructuring charges (including stock-based compensation of $3.5 million), costs related to the Acquisition and stock-based compensation are classified as Corporate expense.