Other Assets (Details) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Prepaid Expenses and Other Current Assets
Inventories	$ 34.4	$ 31.3
Prepaid expenses	51.4	55.9
Other non-trade receivables	69.8	45.4
Income tax receivable	6.3	69.8
Other current assets	7.7	5.0
Total	169.6	207.4
Other Assets
Deferred financing costs	57.9	41.1
Deferred compensation plan	36.7	27.4
Notes and other receivables	35.3	34.0
Reinsurance receivable	51.8	54.5
Other	78.5	80.9
Total	260.2	237.9
Other Assets (Textuals)
Fair value of fuel and commodity hedges included in Other current assets	4.6	3.5
Fair value of interest rate swaps included in Notes and other receivables	$ 1.0	$ 5.2