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Income Taxes (Deferred Income Tax Asset and Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Deferred tax liabilities relating to:    
Differences between book and tax basis of property $ (1,050.9) $ (982.6)
Difference between book and tax basis of intangible assets (713.4) (704.8)
Basis difference due to redemption of partnership interests (128.9) (129.1)
Total liabilities (1,893.2) (1,816.5)
Deferred tax assets relating to:    
Environmental reserves 461.7 438.6
Accruals not currently deductible 210.8 207.9
Net operating loss carryforwards 103.5 124.9
Difference between book and tax basis of other assets 71.3 113.0
Deferred taxes on uncertain tax positions 9.8 14.7
Other 5.0 0.4
Total assets 862.1 899.5
Valuation allowance (63.7) (73.9)
Net deferred tax asset 798.4 825.6
Net deferred tax liabilities $ (1,094.8) $ (990.9)