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Other Expense (Details 1) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Jun. 30, 2013
Other Income and Expenses [Abstract]          
Pension settlement charge $ 49.0   $ 49.0    
Executive retirement and related costs     10.9    
Stock-based compensation expense, long-term incentive plan award     2.4    
Stock-based compensation expense, plan modification & acceleration     8.0    
Other retirement related costs     0.5    
License costs   $ 1.2   $ 1.2  
Nonrefundable payment from customer 16.3   16.3   $ 20.0
Unearned income, current 1.5   1.5    
Unearned income, noncurrent 14.8   14.8    
Development income $ 0.3 $ 0.3 $ 1.1 $ 1.2