Other Assets and Other Liabilities (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Components of Other Liabilities reported on the consolidated balance sheets
Accrued operating lease expense	$ 67.3	$ 74.9
Pension and other post-retirement liabilities	92.3	67.1
Deferred gains on sale-leasebacks	34.9	37.4
Unrecognized tax benefits	18.8	21.3
Environmental reserves	16.7	19.3
Deferred income	15.4	14.4
Derivatives	2.4	5.1
Other	33.8	47.5
Total	$ 281.6	$ 287.0