Financial Instruments (Finance Receivables Balance, Net Of Allowance, By Region And By Class Of Internal Credit Rating) (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	$ 178.2	$ 188.1
Class 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	109.2	128.4
Class 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	65.3	58.0
Class 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	3.7	1.7
North America [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	112.6	100.4
North America [Member] | Class 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	75.7	73.6
North America [Member] | Class 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	36.8	26.7
North America [Member] | Class 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	0.1	0.1
EMEA [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	51.1	63.3
EMEA [Member] | Class 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	29.9	40.3
EMEA [Member] | Class 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	18.3	22.7
EMEA [Member] | Class 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	2.9	0.3
Asia Pacific [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	10.8	17.3
Asia Pacific [Member] | Class 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	2.4	12.7
Asia Pacific [Member] | Class 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	8.2	4.0
Asia Pacific [Member] | Class 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	0.2	0.6
Latin America [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	3.7	7.1
Latin America [Member] | Class 1 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	1.2	1.8
Latin America [Member] | Class 2 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	2.0	4.6
Latin America [Member] | Class 3 [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance Receivables Balance	$ 0.5	$ 0.7