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Stock-Based Compensation Plans (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
shares
Mar. 31, 2015
USD ($)
shares
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2015
USD ($)
period
shares
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
shares
Jun. 22, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Options granted during period   0            
Plan 2010                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares authorized to issue under share based compensation plans   8,700,000            
Common stock available under stock option plan   4,251,797            
Plan 2004                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Expired               827,835
Restricted Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1,489,984       1,489,984   1,856,548  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         648,819      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value (less than $0.1 million during the three months ended September 30, 2014) | $ $ 1.6 $ 39.3 $ 1.5 $ 34.4        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $   $ 44.3         $ 30.6  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   2 years            
Allocated Share-based Compensation Expense, Net of Tax | $ 5.5   5.5   $ 11.5 $ 12.0    
Allocated Share-based Compensation Expense | $ $ 8.3   $ 8.4   $ 17.4 $ 18.3    
Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 732,000       732,000      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period         3 years      
Period for achieving performance targets on performance based units (years) | period         3      
Vesting period         36 months      
Minimum range of vesting provisions 0       0      
Maximum range of vesting provisions 1,421,000       1,421,000      
Estimated vesting of shares based on performance shares 893,000       893,000      
Minimum | Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage         0.00%      
Maximum | Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting percentage         200.00%