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Represents the number of shares (or other type of equity) to be issued under the equity-based compensation plan.

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Represents the remaining number of shares (or other type of equity) available for future issuance under the equity-based compensation plan.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The total fair value of equity-based awards for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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 number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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 vested portions of options outstanding and currently exercisable under the stock option plan.

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The weighted average period between the balance sheet date and expiration for all vested portions of options outstanding and currently exercisable (or convertible) under the plan, which may be expressed in a decimal value for number of years.

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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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The decrease in the number of shares that could be issued attributable to the lapse of rights to exercise previously issued stock options under the terms of the option agreements under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

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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.

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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 weighted average period between the balance sheet date and expiration for all awards outstanding under the plan, which may be expressed in a decimal value for number of years.

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Stock Options, Nonvested Stock, Performance Shares and Common Stock Reserved (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Feb. 28, 2009 Plan	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Share-based Compensation Arrangement by Share-based Payment Award
Number of outstanding plans as of approval date of the 2009 Stock Plan	2
Common stock reserved for issuance stock awards (in shares)		5,863,898
Stock-based compensation expense		$ 15.5	$ 14.7	$ 10.9
Stock-based compensation expense, net of tax		9.8	9.3	6.9
Equity-based compensation plans
Number of Securities to be Issued Upon Exercise of Outstanding Options or Vesting of Performance Share Awards (in shares)		5,518,314
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)		$ 30.72
Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (in shares)		345,584
Weighted-Average Exercise Price
Options outstanding, end of the year (in dollars per share)		$ 30.72
Additional disclosures
Weighted-Average Exercise Price (in dollars per share)		$ 30.72
Net cash proceeds from exercise of stock options		8.0	19.0	0.6
2009 Stock Plan - Stock Options
Share-based Compensation Arrangement by Share-based Payment Award
Period over which awards are exercisable in equal installments, beginning with the first anniversary of the date of grant of awards (in years)		3Y
Tenure of award (in years)		7 years
Stock-based compensation expense		11.4	12.4	10.0
Equity-based compensation plans
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)		$ 30.72	$ 30.32	$ 28.03
Options
Options outstanding, beginning of the year (in shares)		5,158,370	5,330,109	4,324,372
Options granted (in shares)		411,575	954,350,000	1,200,000
Options forfeited (in shares)		(173,009)	(39,836)	(138,934)
Options expired (in shares)		(118,199)	(9,499)
Options exercised (in shares)		(504,023)	(1,076,754)	(55,329)
Options outstanding, end of the year (in shares)		4,774,714	5,158,370	5,330,109
Options exercisable, end of the year (in shares)		3,478,310	2,955,909	2,930,946
Weighted-Average Exercise Price
Options outstanding, beginning of the year (in dollars per share)		$ 30.32	$ 28.03	$ 26.90
Options granted (in dollars per share)		$ 20.90	$ 28.96	$ 30.82
Options forfeited (in dollars per share)		$ 27.22	$ 27.46	$ 23.59
Options expired (in dollars per share)		$ 47.46	$ 54.12
Options exercised (in dollars per share)		$ 15.94	$ 17.66	$ 11.25
Options outstanding, end of the year (in dollars per share)		$ 30.72	$ 30.32	$ 28.03
Options exercisable, end of the year (in dollars per share)		$ 32.13	$ 33.49	$ 30.46
Assumptions:
Risk-free interest rate (as a percent)		0.95%	1.45%	2.34%
Expected volatility (as a percent)		63.88%	61.98%	61.19%
Expected dividend yield (as a percent)		0.00%	0.00%	0.02%
Expected term (in years)		5.23	5.28	5.23
Additional disclosures
Weighted-average per share fair values for stock option granted (in dollars per share)		$ 11.42	$ 15.69	$ 16.67
Unrecognized compensation expense		9.6
Weighted-average period for unrecognized compensation expense to be recognized (in years)		2.2
Number Outstanding (in shares)		4,774,714	5,158,370	5,330,109
Weighted-Average Remaining Contractual Life (in years)		5.5
Weighted-Average Exercise Price (in dollars per share)		$ 30.72	$ 30.32	$ 28.03
Aggregate Intrinsic Value		3.5
Number Outstanding (in shares)		3,478,310	2,955,909	2,930,946
Weighted-Average Remaining Contractual Life (in years)		5.3
Weighted-Average Exercise Price (in dollars per share)		$ 32.13	$ 33.49	$ 30.46
Aggregate Intrinsic Value		3.4
Total intrinsic value of options exercised		9.6	22.8	0.7
Net cash proceeds from exercise of stock options		8.0	19.0	0.6
Actual income tax benefit realized from exercise of stock options		3.5	8.4	0.3
2009 Stock Plan - Stock Options \| Price Range, $ 5.19 - $ 7.95
Equity-based compensation plans
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)		$ 7.28
Options
Options outstanding, end of the year (in shares)		27,467
Options exercisable, end of the year (in shares)		14,731
Weighted-Average Exercise Price
Options outstanding, end of the year (in dollars per share)		$ 7.28
Options exercisable, end of the year (in dollars per share)		$ 7.95
Additional disclosures
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)		$ 5.19
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)		$ 7.95
Number Outstanding (in shares)		27,467
Weighted-Average Remaining Contractual Life (in years)		7.4
Weighted-Average Exercise Price (in dollars per share)		$ 7.28
Aggregate Intrinsic Value		0.2
Exercise prices, outstanding and potentially exercisable stock option awards, low end of range (in dollars per share)		$ 5.19
Exercise prices, outstanding and potentially exercisable stock option awards, high end of range (in dollars per share)		$ 7.95
Number Outstanding (in shares)		14,731
Weighted-Average Remaining Contractual Life (in years)		7.3
Weighted-Average Exercise Price (in dollars per share)		$ 7.95
Aggregate Intrinsic Value		0.1
2009 Stock Plan - Stock Options \| Price Range, $ 12.04 - $ 19.75
Equity-based compensation plans
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)		$ 14.65
Options
Options outstanding, end of the year (in shares)		1,415,948
Options exercisable, end of the year (in shares)		1,047,948
Weighted-Average Exercise Price
Options outstanding, end of the year (in dollars per share)		$ 14.65
Options exercisable, end of the year (in dollars per share)		$ 13.03
Additional disclosures
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)		$ 12.04
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)		$ 19.75
Number Outstanding (in shares)		1,415,948
Weighted-Average Remaining Contractual Life (in years)		6.2
Weighted-Average Exercise Price (in dollars per share)		$ 14.65
Aggregate Intrinsic Value		3.3
Exercise prices, outstanding and potentially exercisable stock option awards, low end of range (in dollars per share)		$ 12.04
Exercise prices, outstanding and potentially exercisable stock option awards, high end of range (in dollars per share)		$ 19.75
Number Outstanding (in shares)		1,047,948
Weighted-Average Remaining Contractual Life (in years)		5.9
Weighted-Average Exercise Price (in dollars per share)		$ 13.03
Aggregate Intrinsic Value		3.3
2009 Stock Plan - Stock Options \| Price Range, $ 28.27 - $ 38.93
Equity-based compensation plans
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)		$ 30.59
Options
Options outstanding, end of the year (in shares)		2,059,394
Options exercisable, end of the year (in shares)		1,143,726
Weighted-Average Exercise Price
Options outstanding, end of the year (in dollars per share)		$ 30.59
Options exercisable, end of the year (in dollars per share)		$ 30.81
Additional disclosures
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)		$ 28.27
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)		$ 38.93
Number Outstanding (in shares)		2,059,394
Weighted-Average Remaining Contractual Life (in years)		5.2
Weighted-Average Exercise Price (in dollars per share)		$ 30.59
Exercise prices, outstanding and potentially exercisable stock option awards, low end of range (in dollars per share)		$ 28.27
Exercise prices, outstanding and potentially exercisable stock option awards, high end of range (in dollars per share)		$ 38.93
Number Outstanding (in shares)		1,143,726
Weighted-Average Remaining Contractual Life (in years)		4.8
Weighted-Average Exercise Price (in dollars per share)		$ 30.81
2009 Stock Plan - Stock Options \| Price Range, $ 39.91 - $ 54.63
Equity-based compensation plans
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)		$ 49.32
Options
Options outstanding, end of the year (in shares)		1,271,905
Options exercisable, end of the year (in shares)		1,271,905
Weighted-Average Exercise Price
Options outstanding, end of the year (in dollars per share)		$ 49.32
Options exercisable, end of the year (in dollars per share)		$ 49.32
Additional disclosures
Exercise prices, outstanding stock option awards, low end of range (in dollars per share)		$ 39.91
Exercise prices, outstanding stock option awards, high end of range (in dollars per share)		$ 54.63
Number Outstanding (in shares)		1,271,905
Weighted-Average Remaining Contractual Life (in years)		5.1
Weighted-Average Exercise Price (in dollars per share)		$ 49.32
Exercise prices, outstanding and potentially exercisable stock option awards, low end of range (in dollars per share)		$ 39.91
Exercise prices, outstanding and potentially exercisable stock option awards, high end of range (in dollars per share)		$ 54.63
Number Outstanding (in shares)		1,271,905
Weighted-Average Remaining Contractual Life (in years)		5.1
Weighted-Average Exercise Price (in dollars per share)		$ 49.32
Equity compensation plans approved by security holders
Equity-based compensation plans
Number of Securities to be Issued Upon Exercise of Outstanding Options or Vesting of Performance Share Awards (in shares)		5,518,314
Weighted-Average Exercise Price of Outstanding Options (in dollars per share)		$ 30.72
Number of Securities Remaining Available for Future Issuance Under Equity Compensation Plans (in shares)		345,584
Weighted-Average Exercise Price
Options outstanding, end of the year (in dollars per share)		$ 30.72
Additional disclosures
Weighted-Average Exercise Price (in dollars per share)		$ 30.72
Nonvested stock awards
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		3.0	0.9	0.3
Additional disclosures
Unrecognized compensation expense		4.1
Weighted-average period for unrecognized compensation expense to be recognized (in years)		2.6
Number of Shares
Nonvested, beginning of the year (in shares)		128,907	2,935	63,816
Granted (in shares)		166,412	141,682	11,000
Forfeited (in shares)		(5,000)		(542)
Vested (in shares)		(61,704)	(15,710)	(71,339)
Nonvested, end of the year (in shares)		228,615	128,907	2,935
Weighted-Average Grant Date Fair Value
Nonvested, beginning of the year (in dollars per share)		$ 30.22	$ 53.40	$ 51.91
Granted (in dollars per share)		$ 21.99	$ 30.93	$ 7.95
Forfeited (in dollars per share)		$ 28.73		$ 54.85
Vested (in dollars per share)		$ 32.12	$ 40.91	$ 45.04
Nonvested, end of the year (in dollars per share)		$ 23.75	$ 30.22	$ 53.40
Fair value of shares vested		1.5	0.6	1.0
Performance share awards
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		1.1	1.4	0.6
Assumptions:
Risk-free interest rate (as a percent)		0.29%	0.73%	1.48%
Expected volatility (as a percent)		76.98%	79.86%	77.70%
Expected term (in years)		3.00	3.00	3.00
Number of Shares
Granted (in shares)		144,000	75,000	134,500
Nonvested, end of the year (in shares)		371,800
Weighted-Average Grant Date Fair Value
Nonvested, beginning of the year (in dollars per share)		$ 13.88	$ 17.26
Nonvested, end of the year (in dollars per share)		$ 9.75	$ 13.88	$ 17.26
Period over which shareholder return compares favorably to that of a competitor group of companies for purposes of calculating executive performance shares earned (in years)		3
Potential payouts, low end of range (as a percent)		0.00%
Potential payouts, high end of range (as a percent)		200.00%
Stock Appreciation Rights
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		0.2
Additional disclosures
Unrecognized compensation expense		3.5
Weighted-average period for unrecognized compensation expense to be recognized (in years)		1.5
Number of Shares
Granted (in shares)		441,000
Cash-Settled Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		0.1
Additional disclosures
Unrecognized compensation expense		$ 4.1
Weighted-average period for unrecognized compensation expense to be recognized (in years)		1.5
Number of Shares
Granted (in shares)		269,000