Quarterly report pursuant to Section 13 or 15(d)

Auction Rate Securities (Details)

 v2.3.0.11
Auction Rate Securities (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2008
Changes in auction rate securities available for sale      
Balance at the beginning of the period $ 11.9    
Change in fair value 0.5    
Sales and redemptions (12.4) (23.0)  
Auction rate securities included in accumulated other comprehensive loss (pre-tax), changes during the year      
Amount included in accumulated other comprehensive loss (pre-tax) 0.5    
Auction rate securities, sales and redemptions adjustment to accumulated other comprehensive loss 0.5    
Gain included in investment income and other (pre-tax)      
Sales and redemptions 0.5    
Liquidation of Auction Rate Securities      
Auction rate securities, amount of original portfolio (par value)     $ 56.9
Recovery of historical cost of auction rate securities at the time of liquidation (as a percent) 95.50%