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Stock-Based Compensation Plans (Details) - Restricted stock awards - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Stock-Based Compensation Plans        
Straight-line amortization period     3 years 11 months 12 days  
Unrecognized compensation cost $ 14.1   $ 14.1  
Number of Shares        
Unvested at the beginning of the period (in shares)     929,000  
Unvested at the end of the period (in shares) 929,000   929,000  
Weighted-Average Grant-Date Fair Value        
Unvested at the beginning of the period (in dollars per share)     $ 19.70  
Unvested at the end of the period (in dollars per share) $ 19.70   $ 19.70  
General and administrative expenses        
Stock-Based Compensation Plans        
Stock-based compensation expense $ 0.9 $ 0.8 $ 1.8 $ 0.8