|
Earnings Per Share (Details) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Mar. 31, 2012
|
Mar. 31, 2011
|
Mar. 31, 2012
|
Mar. 31, 2011
|
|
| Income per common share | ||||
| Net income basic and diluted | $ 27.4 | $ 33.0 | $ 58.7 | $ 60.1 |
| Weighted average shares outstanding - basic (in shares) | 62.2 | 62.1 | 62.1 | 62.0 |
| Effect of dilutive stock options and unvested time based restricted stock awards | 0.4 | 0.3 | ||
| Weighted average shares outstanding - diluted (in shares) | 62.6 | 62.1 | 62.4 | 62.0 |
|
Restricted stock units and stock option awards
|
||||
| Income per common share | ||||
| Stock-based awards excluded from the computation of diluted earnings per share (in shares) | 1.7 | 2.0 | ||
|
Performance-based stock awards
|
||||
| Income per common share | ||||
| Stock-based awards excluded from the computation of diluted earnings per share as related performance period is not yet complete (in shares) | 1.8 | 1.6 | ||
| X | ||||||||||
|
- Definition
Securities that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU as the related performance criteria was not met. No definition available.
|
| X | ||||||||||
|
- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|