QUARTERLY FINANCIAL DATA (UNAUDITED) (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended	3 Months Ended			9 Months Ended	12 Months Ended		3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2012	Mar. 31, 2013 Fiscal year ended March 31, 2012	Mar. 31, 2013 Periods prior to the fiscal year 2012	Mar. 31, 2013 Saturn Electronics and Engineering, Inc	Dec. 31, 2011 Cost Of Sales	Mar. 31, 2011 Cost Of Sales	Mar. 31, 2010 Cost Of Sales	Sep. 28, 2012 Warrant	Sep. 28, 2012 Warrant Out-of-period	Mar. 31, 2013 Warrant Out-of-period
Schedule of quarterly financial information
Fair value adjustment										$ 23.0	$ 12.8	$ 5.7
Valuation allowances for deferred tax assets		4.2				22.3
Errors primarily understated	9.3			6.1	3.2		0.8	10.4	8.0
Decrease in net income from correction of errors		$ 21.5	$ 24.9
Decrease in earnings per share from correction of errors		$ 0.03	$ 0.03