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Goodwill and Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Sep. 30, 2011
Jun. 30, 2011
Component of Company's Intangible Assets [Abstract]      
Goodwill (not subject to amortization) $ 2,756.0 $ 1,562.2 $ 1,612.0
Intangible assets:      
Customer relationships, noncompete agreements and other 689.3 232.1 240.6
Trademarks and tradenames (not subject to amortization) 189.6 47.9 51.9
Gross carrying amount 878.9 280.0 292.5
Accumulated amortization (161.2) (132.2) (133.0)
Net carrying amount $ 717.7 $ 147.8 $ 159.5