General (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2013 Reversal of revenue earnout liability	Mar. 31, 2012 Reduction in estimated bonus
Change in estimates
Reduction/reversal of estimated liability in the period	$ 0.8	$ 1.1
Increase in income from continuing operations	0.5	0.6
Increase in net income	$ 0.5	$ 0.6
Increase in diluted earnings per share (in dollars per share)	$ 0.02	$ 0.02