Goodwill and intangibles, net - Finite-lived intangibles (Details) (USD $) In Millions	9 Months Ended
	Jun. 30, 2011
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	$ 260.4
Finite-Lived Intangible Assets, Accumulated Amortization	(80.8)
Finite-Lived Intangible Assets, Net	179.6
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Future Amortization Expense, Remainder of Fiscal Year	14.8
Future Amortization Expense, Year Two	14.6
Future Amortization Expense, Year Three	12.5
Future Amortization Expense, Year Four	9.1
Future Amortization Expense, Year Five	6.8
Future Amortization Expense, Year Six	6.8
Future Amortization Expense, after Year Six	8.6
Tradenames / Brands [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	19.3
Finite-Lived Intangible Assets, Accumulated Amortization	(10.1)
Finite-Lived Intangible Assets, Net	9.2
Technology and Patents [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	76.7
Finite-Lived Intangible Assets, Accumulated Amortization	(37.5)
Finite-Lived Intangible Assets, Net	39.2
Customer Related and Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Net [Abstract]
Finite-Lived Intangible Assets, Gross	164.4
Finite-Lived Intangible Assets, Accumulated Amortization	(33.2)
Finite-Lived Intangible Assets, Net	$ 131.2