Pension And Other Postretirement Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Pension and Other Postretirement Benefit Expense	$ 1.5	$ 1.1	$ 1.3
Revised healthcare cost trend assumption	7.60%
Ultimate healthcare cost trend rate	4.50%
Year that rate reaches healthcare cost trend rate	2028
Effect of one-percentage-point increase on accumulated postretirement benefit obligation	1.5
Effect of one-percentage-point decrease on accumulated postretirement benefit obligation	1.4
Net actuarial loss expected in net periodic benefit cost during fiscal year 2014	10.3
Prior service benefit expected in net periodic benefit cost during fiscal year 2014	0.2
Percentage of total plan assets	91.00%
Percentage of total projected benefit obligation	80.00%
Expected company contributions in 2014	12.9
ERISA-regulated U.S. plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions in 2014	10.2
Non-ERISA regulated and Other Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Expected company contributions in 2014	$ 2.7