Property and Equipment (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Property and equipment
Property and equipment, gross	$ 571.8	$ 553.9
Less accumulated depreciation and amortization	(484.0)	(459.7)
Property and equipment, net	87.8	94.2
Property and Equipment (Textual) [Abstract]
Net book value of computer equipment procured under capital lease arrangements	13.9	19.3
Accumulated depreciation of computer equipment procured under capital lease arrangements	11.9	11.4
Depreciation expense	37.8	39.1	38.2
Computers, software, furniture and equipment [Member]
Property and equipment
Property and equipment, gross	513.6	498.8
Leasehold improvements [Member]
Property and equipment
Property and equipment, gross	46.7	49.4
Projects in progress [Member]
Property and equipment
Property and equipment, gross	$ 11.5	$ 5.7

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References+ Details

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References+ Details

- Definition

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details

- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details