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Stock-based Compensation Plans (Details)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 17, 2017
service_period
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Sep. 22, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation | $   $ 6.7 $ 5.3 $ 11.7 $ 9.4  
February 17, 2017 [Member] | 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, Payout Curve, Maximum Percentage of Original Award 200.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage Increase in Awards If In Top Quartile 25.00%          
Share-based Compensation Arrangement by Share-based Payment Award, Percentage Decrease If In Bottom Quartile 25.00%          
February 17, 2017 [Member] | Performance-Based Awards [Member] | 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, Other Award 3 years          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Requisite Service Periods | service_period 3          
February 23, 2016 [Member] | 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]            
Maximum number of performance share units as percentage of original award (in percent)           250.00%
February 23, 2016 [Member] | RSUs, PSUs, and Other Employee Awards [Member] | Executive Long-Term Incentive Compensation Plan (the “ELTI Plan”) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation | $   $ 6.7 $ 5.3 $ 11.7 $ 9.4  
NEOs [Member] | February 17, 2017 [Member] | 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 25,119          
Share-based Compensation Arrangement by Share-based Payment Award, Performance period under adopted ELTI Plan | service_period 3          
NEOs [Member] | February 17, 2017 [Member] | 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 28,467          
Share-based Compensation Arrangement by Share-based Payment Award, Other Award 34 months          
Grantees [Member] | February 17, 2017 [Member] | 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 61,530          
Share-based Compensation Arrangement by Share-based Payment Award, Performance period under adopted ELTI Plan | service_period 3