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Stock-Based Compensation (Performance Stock Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2019
Jul. 30, 2019
Mar. 31, 2019
Jul. 31, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Unvested activity                    
Nonvested at the beginning of the period (in shares)             494,882 494,882    
Granted (in shares)               277,307    
Forfeited (in shares)               (70,391)    
Cancellations (in shares)               (22,977)    
Nonvested at the end of the period (in shares)               465,584 494,882  
Weighted Average Grant Date Fair Value                    
Share-based Compensation Arrangement by Share-based Payment awary, Non-Option Equity Instruments, Cancellations               236,214    
Performance Stock Units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Performance period             3 years      
Fair value assumptions                    
Risk-free interest rate (as a percent) 1.57% 1.75% 2.48% 2.69% 2.36% 1.54%        
Dividend yield (as a percent) 0.00% 0.00% 0.00% 0.00% 0.00% 0.00%        
Expected Life (Years) 2 years 4 months 28 days 2 years 6 months 2 years 9 months 25 days 2 years 5 months 1 day 2 years 9 months 29 days 2 years 9 months 29 days        
Volatility 34.90% 34.30% 33.80% 33.10% 34.70% 34.20%        
Fair value of award (in dollars per share) $ 23.38 $ 40.07 $ 29.04 $ 39.06 $ 29.56 $ 17.05   $ 28.51    
Recognized stock-based compensation expense               $ 5.1 $ 4.3 $ 3.2
Unrecognized stock-based compensation expense               $ 6.5    
Unrecognized stock-based compensation expense, period of recognition               1 year 8 months 12 days    
Unvested activity                    
Granted (in shares) 38,006 6,189 233,112 6,742 233,266 286,251        
Weighted Average Grant Date Fair Value                    
Nonvested at the beginning of the period (in dollars per share)             $ 23.13 $ 23.13    
Granted (in dollars per share) $ 23.38 $ 40.07 $ 29.04 $ 39.06 $ 29.56 $ 17.05   28.51    
Forfeited (in dollars per share)               26.23    
Cancellations (in dollars per share)               17.05    
Nonvested at the end of the period (in dollars per share)               $ 28.95 $ 23.13  
Shares expected to be issued (in shares)               472,428    
Performance Stock Units | Minimum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Payout of PSUs (percent of initial grant)               0.00%    
Performance Stock Units | Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Payout of PSUs (percent of initial grant)               200.00%