Goodwill and Intangible Assets - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 8.9	$ 13.6	$ 22.2	$ 26.9
Remainder of fiscal 2014	26.3		26.3
Fiscal 2015	49.9		49.9
Fiscal 2016	43.5		43.5
Fiscal 2017	36.9		36.9
Fiscal 2018	35.6		35.6
Customer Relationships | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives of amortizable intangible assets	15 years
Noncompete Agreements | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful lives of amortizable intangible assets	15 years
Cost of Sales
Finite-Lived Intangible Assets [Line Items]
Amortization expense of intangible assets	$ 0	$ 0	$ 0	$ 0