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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2016
Income Tax Disclosure [Abstract]          
Effective income tax rate (percent) 35.90% 35.40% 35.50% 35.20%  
Realized reduction in deferred tax liabilities from sale of assets     $ 27.5    
Ownership percentage, subsidiaries 100.00%   100.00%    
Net operating loss carryforwards $ 14.0   $ 14.0    
Deferred tax assets, operating loss carryforwards 5.0   5.0    
Operating loss carryforwards, limitation on use, annual amount 33.6   33.6    
Uncertain tax liability $ 4.1   $ 4.1   $ 4.1