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Stock-Based Compensation - Summary of Stock-Based Compensation Expense by Type of Award (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Dec. 31, 2015
Mar. 31, 2016
Feb. 28, 2015
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense (benefit) $ (0.4) $ 2.3 $ 5.3
Stock Appreciation Rights [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense (benefit) (1.4) 0.4 2.5
Stock Options [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense (benefit) 0.1 0.2 0.1
Restricted Shares, Service Based [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense (benefit) 0.3 0.8 1.7
Restricted Shares, Performance Based [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense (benefit) 0.6 0.8 1.0
Employee Stock Purchase Plan [Member]      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Total stock-based compensation expense (benefit) $ 0.0 $ 0.1 $ 0.0