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Equity Incentive Programs (Equity Incentive Programs and Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option exercise price floor of fair market value of class A common stock (percent)     100.00%  
Stock-based compensation $ (1.9) $ 4.6 $ 4.0 $ 13.2
Estimated future compensation expense $ 19.4   19.4  
Tax benefit (expense) on equity award activity     $ 1.8 $ (0.9)
Stock Option Plan, Omnibus [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate shares of common stock reserved (in shares) 7,871,652   7,871,652  
Shares available for issuance (in shares) 1,156,883   1,156,883  
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     4 years  
Estimated Expense in 2015 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense $ 3.1   $ 3.1  
Estimated Expense in 2016 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense 10.0   10.0  
Estimated Expense in 2017 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense 5.5   5.5  
Estimated Expense in 2018 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated future compensation expense $ 0.8   $ 0.8