Accounts Payable and Accrued Expenses (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounts payable and accrued expenses
Trade accounts payable	$ 555.0	$ 735.6
Other accrued expenses	372.1	274.0
Accrued payroll and related benefits	256.8	254.7
Accrued taxes other than income	203.8	210.5
Accrued royalties	82.3	77.8
Accrued interest	47.5	49.7
Accrued health care insurance	21.3	9.3
Workers’ compensation obligations	18.4	17.3
Accrued environmental	10.6	11.6
Commodity and foreign currency hedge contracts	5.8	7.9
Liabilities associated with discontinued operations	33.3	63.9
Total accounts payable and accrued expenses	$ 1,606.9	$ 1,712.3