Annual report pursuant to Section 13 and 15(d)

Income Taxes (Components Of Our Deferred Tax Assets and Liabilities) (Details)

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Income Taxes (Components Of Our Deferred Tax Assets and Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Deferred tax assets:    
Pensions $ 154.8 $ 108.5
Postretirement benefits other than pensions 109.8 92.0
Alternative minimum tax credit carryforwards 228.5 153.4
Capital loss carryforwards 3.8 1.3
Development   0.9
Asset retirement obligations 42.9 42.0
Operating loss carryforwards 260.7 134.2
Product inventories 30.1 21.0
Properties 44.8 38.7
Lease liabilities 38.8 36.9
Other liabilities 149.3 85.4
Total deferred tax assets before valuation allowance 1,063.5 714.3
Deferred tax asset valuation allowance 223.9 172.7
Net deferred tax assets 839.6 541.6
Deferred tax liabilities:    
Properties 1,345.0 222.6
Investment in ventures 155.9 72.7
Intangible assets 13.5 14.8
Income tax uncertainties 56.7 37.5
Financial derivatives 1.3 11.7
Deferred revenue   45.3
Other assets 98.2 58.3
Total deferred tax liabilities 1,670.6 462.9
Net deferred tax (liabilities) assets $ (831.0) $ 78.7