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Stock-based Compensation Plans (Details)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 23, 2016
service_period
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   $ 5.3 $ 3.4 $ 9.4 $ 6.1
Current Year Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense       2.1  
Prior-Year Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Allocated Share-based Compensation Expense       7.3  
Restricted Stock Units (RSUs) [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]          
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, Grants in Period | shares 24,677        
Share-based Compensation Arrangement by Share-based Payment Award, Performance period under adopted ELTI Plan | service_period 3        
Performance Share Units [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]          
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, Grants in Period | shares 29,633        
Share-based Compensation Arrangement by Share-based Payment Award, Other Award 34 months        
Maximum number of performance share units as percentage of original award (in percent) 250.00%        
RSU and PSU awards [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested compensation expense   6.2   6.2  
Other Awards [Member]          
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, Grants in Period | shares 67,468        
Share-based Compensation Arrangement by Share-based Payment Award, Other Award 3 years        
Unvested compensation expense   $ 7.0   $ 7.0