Stockholders' Equity Share repurchase and retirement (Details) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2016	Jun. 13, 2016	Jan. 16, 2015
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 3.6
Stock Repurchase Program, Authorized Amount		$ 150.0	$ 100.0
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 98.0
Stock Repurchased During Period, Shares	97,500
Additional Paid-in Capital [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 1.0
Retained Earnings [Member]
Class of Stock [Line Items]
Stock Repurchased and Retired During Period, Value	$ 2.6