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Restructuring (Details 2) (Employee Severance, USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Severance
     
Utilization of restructuring accruals      
Remaining accrual at the beginning of the period $ 13.1 $ 16.7 $ 38.7
Expense provision 49.2    
Cash payments and other (30.3) (26.8) (62.2)
Changes in estimates (3.2) (5.0) (4.8)
Remaining accrual at the end of the period $ 28.8 $ 13.1 $ 16.7