Equity Incentive Plans, Stock Options Outstanding (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Summary of information about stock options outstanding [Line Items]
Aggregate intrinsic value of options exercisable related to stock incentive plans	$ 41.0
Closing price of company's common stock related to calculation of aggregate intrinsic value of stock options (in dollars per share)	$ 37.20
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Option shares outstanding beginning balance (in shares)	5,496,924	8,459,779	10,081,533
Options granted (in shares)	0	0	12,000
Options exercised (shares)	(2,129,260)	(2,885,365)	(1,492,866)
Options canceled (in shares)	(6,667)	(77,490)	(140,888)
Option shares outstanding ending balance (in shares)	3,360,997	5,496,924	8,459,779
Option shares outstanding beginning balance (in dollars per share)	$ 25.21	$ 24.52	$ 24.20
Options granted (in dollars per shares)	$ 0.00	$ 0.00	$ 27.03
Options exercised (in dollars per share)	$ 25.53	$ 23.09	$ 22.03
Options canceled (in dollars per share)	$ 25.05	$ 29.39	$ 27.79
Option shares outstanding ending balance (in dollars per share)	$ 25.00	$ 25.21	$ 24.52
Stock Option [Member]
Summary of information about stock options outstanding [Line Items]
Total intrinsic value of options exercised related to stock incentive plans	26.7	29.8	7.6
Aggregate intrinsic value of options outstanding related to stock incentive plans	$ 41.0
Exercisable number of option shares (in shares)	3,360,997,000	5,491,363,000
Weighted average exercise price per share of exercisable options (in dollars per share)	$ 25.00	$ 25.20
Weighted average fair value per share of stock options granted			$ 5.90
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term			6.50
Volatility			36.00%
Risk free interest rate			3.00%
Dividend yield			5.00%

Closing price per share of company's common stock at balance sheet date

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of vested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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The combined weighted average exercise price associated with stock options during the period that have either lapsed or been forfeited.

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Net number of share options (or share units) granted during the period.

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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices pertaining to options outstanding under the plan as of the balance sheet date.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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Number of share options (or share units) exercised during the current period.

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