Commitments and Contingencies - Contigent Consideration for Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended							12 Months Ended											12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2013 Tradewire Acquisition [Member] [Member]	Sep. 30, 2013 Hencorp Acquisition [Member]	Sep. 30, 2012 Hencorp Acquisition [Member]	Jul. 08, 2013 Hanley Group Acquisition [Member]	Sep. 30, 2013 RMI-RMC Acquistion [Member]	Sep. 30, 2012 RMI-RMC Acquistion [Member]	Jun. 30, 2013 RMI-RMC Acquistion [Member]	Sep. 30, 2013 Tradewire Acquisition [Member] [Member]	Oct. 31, 2010 Tradewire Acquisition [Member] [Member]	Sep. 30, 2013 Tradewire Acquisition [Member] [Member]	Jun. 30, 2013 Coffee Network Acquisition [Member]	Nov. 30, 2011 Coffee Network Acquisition [Member]	Sep. 30, 2013 Hencorp Acquisition [Member]	Oct. 31, 2011 Hencorp Acquisition [Member]	Oct. 31, 2010 Hencorp Acquisition [Member]	Sep. 30, 2013 Hanley Group Acquisition [Member]	Sep. 30, 2012 Hanley Group Acquisition [Member]	Sep. 30, 2013 Contingent Consideration [Member]	Sep. 30, 2012 Contingent Consideration [Member]	Sep. 30, 2011 Contingent Consideration [Member]
Business Acquisition, Contingent Consideration [Line Items]
Accounts payable and other accrued liabilities - contingent consideration, fair value	$ 9.6	$ 14.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Period Increase (Decrease)																					2.6	2.0	3.1
Business Combination, Consideration Transferred													5.6		0.3
Business Acquisition, Contingent Consideration, Potential Cash Payment							(10.0)										0.7
Business Acquisition, Contingent Consideration, Potential Cash Payment, Year One												0.9					0.7
Business Acquisition, Contingent Consideration, Potential Cash Payment, Year Two												2.0					2.8
Business Acquisition, Contingent Consideration, Potential Cash Payment Year Three												5.5
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	8.2	2.1	5.4	0.7	1.0	0.1		0.2	0										0.7	2.0
Business Combination, Consideration, Including Contingent Consideration											6.3						7.5
Business Acquisition, Cost of Acquired Entity, Purchase Price														0.1		7.5
Business Acquisition, Contingent Consideration, at Fair Value					3.2					(3.1)					0.1			2.3
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed		$ 0.4