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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Mar. 31, 2016
Income Tax Disclosure [Abstract]          
Effective income tax rate (percent) 37.60% 35.20% 36.70% 35.20%  
Realized reduction in deferred tax liabilities from sale of assets     $ 37.7    
Ownership percentage, subsidiaries 100.00%   100.00%    
Net operating loss carryforwards $ 7.1   $ 7.1    
Deferred tax assets, operating loss carryforwards 2.5   2.5    
Operating loss carryforwards, limitation on use, annual amount 33.6   33.6    
Uncertain tax liability 3.7   $ 3.7   $ 4.1
Reduction in uncertain tax liability from lapse 1.0        
Increase in uncertain tax liability for the current period $ 0.6