Retirement Plans Change in Level 3 Pension Assets (Details) (USD $) In Millions, unless otherwise specified									12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009	Sep. 30, 2012 Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2011 Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2012 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Cash and Cash Equivalents [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Cash and Cash Equivalents [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2011 Cash and Cash Equivalents [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2012 US Treasury and Government [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 US Treasury and Government [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 US Treasury and Government [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 US Treasury and Government [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 US Treasury and Government [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 US Treasury and Government [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 US Treasury and Government [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2011 US Treasury and Government [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2012 Debt Securities [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Debt Securities [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Debt Securities [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Debt Securities [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Debt Securities [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Debt Securities [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Debt Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2011 Debt Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2012 Equity Securities [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Equity Securities [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Equity Securities [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Equity Securities [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Equity Securities [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Equity Securities [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Equity Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2011 Equity Securities [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2012 Real Estate [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2011 Real Estate [Member] Fair Value, Inputs, Level 1 [Member]	Sep. 30, 2012 Real Estate [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2011 Real Estate [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2012 Real Estate [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2011 Real Estate [Member] Fair Value, Inputs, Level 3 [Member]	Sep. 30, 2012 Real Estate [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Sep. 30, 2011 Real Estate [Member] Estimate of Fair Value, Fair Value Disclosure [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Defined Benefit Plan, Fair Value of Plan Assets, Beginning of Period	$ 26.5	$ 24.2	$ 24.2	$ 18.9	$ 0	$ 0.2	$ 26.5	$ 24.6	$ 0	$ 1.3	$ 26.5	$ 24.8	$ 0	$ 0	$ 0.4	$ 0.5	$ 0	$ 0	$ 0.4	$ 0.5	$ 0	$ 0	$ 0.8	$ 0.9	$ 0	$ 0	$ 0.8	$ 0.9	$ 0	$ 0	$ 7.7	$ 6.0	$ 0	$ 0	$ 7.7	$ 6.0	$ 0	$ 0	$ 16.6	$ 15.5	$ 0	$ 0	$ 16.6	$ 15.5	$ 0	$ 0	$ 1.0	$ 1.7	$ 0	$ 0	$ 1.0	$ 1.7
Defined Benefit Plan, Divestitures, Plan Assets										(1.3)
Defined Benefit Plan, Actual Return on Plan Assets Still Held									0	0
Defined Benefit Plan, Purchases, Sales, and Settlements									0
Defined Benefit Plan, Fair Value of Plan Assets, End of Period	$ 26.5	$ 24.2	$ 24.2	$ 18.9	$ 0	$ 0.2	$ 26.5	$ 24.6	$ 0	$ 0	$ 26.5	$ 24.8	$ 0	$ 0	$ 0.4	$ 0.5	$ 0	$ 0	$ 0.4	$ 0.5	$ 0	$ 0	$ 0.8	$ 0.9	$ 0	$ 0	$ 0.8	$ 0.9	$ 0	$ 0	$ 7.7	$ 6.0	$ 0	$ 0	$ 7.7	$ 6.0	$ 0	$ 0	$ 16.6	$ 15.5	$ 0	$ 0	$ 16.6	$ 15.5	$ 0	$ 0	$ 1.0	$ 1.7	$ 0	$ 0	$ 1.0	$ 1.7