Profit Sharing, Retirement Savings Plans and Defined Benefit Pension Plans (Details 1) (U.S. pension plans [Member], USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Weighted average assumptions used to determine benefit obligations
Discount rate	4.60%	5.40%
Rate of compensation increase	3.50%	3.50%
Weighted average assumptions used to determine net periodic benefit cost
Discount rate	4.90%	5.50%	6.00%
Expected long-term rate of return	6.70%	7.30%	8.00%
Rate of compensation increase	3.50%	3.50%	3.50%
Estimated Future Benefit Payments
2012	$ 11.4
2013	12.8
2014	11.7
2015	12.4
2016	14.7
2017-2021	71.7
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	171.2	40.8	37.9
U.S. equity index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	4.2
U.S. bond index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	96.4
Short-term investment fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	64.8
Fair Value, Inputs, Level 1 [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	0
Fair Value, Inputs, Level 1 [Member] | U.S. equity index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	0
Fair Value, Inputs, Level 1 [Member] | U.S. bond index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	0
Fair Value, Inputs, Level 1 [Member] | Short-term investment fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	0
Fair Value, Inputs, Level 2 [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	165.9
Fair Value, Inputs, Level 2 [Member] | U.S. equity index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	4.2
Fair Value, Inputs, Level 2 [Member] | U.S. bond index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	96.4
Fair Value, Inputs, Level 2 [Member] | Short-term investment fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	64.8
Fair Value, Inputs, Level 3 [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	5.3
Fair Value, Inputs, Level 3 [Member] | U.S. equity index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	0
Fair Value, Inputs, Level 3 [Member] | U.S. bond index fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	0
Fair Value, Inputs, Level 3 [Member] | Short-term investment fund [Member]
Fair values of pension plan assets, by asset category and level of fair values
Fair value of plan assets	$ 0