Special Charges (Details) - Unusual or Infrequent Item [Member] - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Unusual or Infrequent Item [Line Items]
Other Nonrecurring Expense	$ 4.0	$ 2.8	$ 3.0
Legal settlement costs	4.3
Unusual or Infrequent Item, Insurance Proceeds	11.5
Severance related, office closing and other costs	$ 11.2