|
Earnings per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Sep. 30, 2012
|
Jun. 30, 2012
|
Mar. 31, 2012
|
Dec. 31, 2011
|
Sep. 30, 2011
|
Jun. 30, 2011
|
Mar. 31, 2011
|
Dec. 31, 2010
|
Sep. 30, 2012
|
Sep. 30, 2011
|
Sep. 30, 2010
|
May 29, 2012
Restricted Stock Units (RSUs) [Member]
|
May 29, 2012
Stock Options [Member]
|
Sep. 30, 2012
Restricted Stock [Member]
|
Sep. 30, 2011
Restricted Stock [Member]
|
Sep. 30, 2010
Restricted Stock [Member]
|
Feb. 03, 2012
Restricted Stock [Member]
|
Sep. 30, 2012
Stock Appreciation Rights (SARs) [Member]
|
Sep. 30, 2011
Stock Appreciation Rights (SARs) [Member]
|
Sep. 30, 2010
Stock Appreciation Rights (SARs) [Member]
|
Sep. 07, 2012
Stock Appreciation Rights (SARs) [Member]
|
Feb. 03, 2012
Stock Appreciation Rights (SARs) [Member]
|
|
| Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] | ||||||||||||||||||||||
| Equity Instruments Granted In Spinoff Transaction | 0.1 | 0.3 | ||||||||||||||||||||
| Net Income (Loss) Attributable to Parent | $ 10.8 | $ 15.8 | $ 10.5 | $ 12.8 | $ (479.6) | $ 1.6 | $ 29.1 | $ 24.6 | $ 49.9 | $ (424.3) | $ 92.0 | |||||||||||
| Weighted Average Number of Shares Outstanding, Basic | 34.3 | 34.4 | 34.4 | |||||||||||||||||||
| Incremental Common Shares Attributable to Share-based Payment Arrangements | 0.2 | 0 | 0 | 0.1 | 0 | 0 | 0.1 | 0 | 0 | |||||||||||||
| Weighted Average Number of Shares Outstanding, Diluted | 34.5 | 34.4 | 34.4 | |||||||||||||||||||
| Earnings Per Share, Basic | $ 0.32 | $ 0.46 | $ 0.31 | $ 0.37 | $ (13.94) | $ 0.05 | $ 0.85 | $ 0.72 | $ 1.45 | $ (12.33) | $ 2.67 | |||||||||||
| Earnings Per Share, Diluted | $ 0.31 | $ 0.46 | $ 0.30 | $ 0.37 | $ (13.94) | $ 0.05 | $ 0.85 | $ 0.72 | $ 1.45 | $ (12.33) | $ 2.67 | |||||||||||
| Shares, Issued | 0.4 | 1.8 | 0.1 | |||||||||||||||||||