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Equity Securities and Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended		6 Months Ended
	Feb. 29, 2012	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Equity Securities and Stock-based Compensation
Amount available for future offerings of securities	$ 210.0
Stock-based compensation expense		0.3	1.0	0.9	2.0
Total compensation cost related to unvested awards not yet recognized		$ 1.6		$ 1.6
2010 Incentive Compensation Plan
Equity Securities and Stock-based Compensation
Increase in the number of shares of common stock available for issuance (in shares)		2,700,000
Shares authorized for issuance, before additional authorization (in shares)		2,500,000		2,500,000
Shares authorized for issuance (in shares)		5,200,000		5,200,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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