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Intangible Assets Intangible Assets - Indefinite-Lived Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Mar. 31, 2013
Sep. 30, 2012
Indefinite-lived Intangible Assets [Line Items]    
Gross Finite and Indefinite-Lived Intangible Assets $ 20.5 $ 17.4
Finite and Indefinited-Lived Accumulated Amortization and Impairment Charges (7.3) (6.3)
Intangible Assets, Net (Excluding Goodwill) 13.2 11.1
Trade Names [Member]
   
Indefinite-lived Intangible Assets [Line Items]    
Indefinite-Lived Trade Names 1.2 1.2
Indefinite-lived Intangible Assets, Impairment Losses $ 0 $ 0