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Commitments and Contingent Liabilities (Details) (USD $)
In Millions
Sep. 30, 2011
Minimum future rental commitments under operating leases having noncancelable lease terms 
Minimum future rental commitments under operating leases in 2012$ 75.7
Minimum future rental commitments under operating leases in 201358.8
Minimum future rental commitments under operating leases in 201448.8
Minimum future rental commitments under operating leases in 201537.0
Minimum future rental commitments under operating leases in 201627.8
Minimum future rental commitments under operating leases beyond 2016108.0
Minimum future rental commitments under operating leases, Total$ 356.1