Quarterly report pursuant to Section 13 or 15(d)

Retirement Benefits (Details)

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Retirement Benefits (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2012
Mar. 31, 2011
Defined benefit plans        
Net pension costs     $ 6.3 $ 4.6
Defined Contribution Plans        
Expenses related to defined contribution plans 2.1 1.7 3.9 3.3
Pension plans
       
Defined benefit plans        
Service costs 1.5 1.4 3.0 2.7
Interest costs 3.1 3.2 6.3 6.4
Expected return on plan assets (3.3) (3.8) (6.7) (7.6)
Amortization of unrecognized prior service cost, net 0.2 0.2 0.4 0.4
Amortization of net loss 1.5 1.0 2.9 2.0
Net pension costs 3.0 2.0 5.9 3.9
Postretirement healthcare plan
       
Defined benefit plans        
Net pension costs $ 0.2 $ 0.4 $ 0.4 $ 0.7