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Income Taxes (Deferred Income Tax Asset and Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax liabilities relating to:    
Differences between book and tax basis of property and equipment $ (949.2) $ (1,010.7)
Difference between book and tax basis of intangible assets (503.7) (464.6)
Operating right-of-use lease assets (66.5) (60.9)
Basis difference due to redemption of partnership interests (82.2) (85.3)
Total liabilities (1,601.6) (1,621.5)
Deferred tax assets relating to:    
Environmental reserves 217.6 224.6
Accruals not currently deductible 82.4 84.5
Net operating loss carryforwards 105.1 111.8
Difference between book and tax basis of other assets 22.5 21.7
Operating right-of-use lease liabilities 66.4 61.1
Other 14.1 13.3
Total assets 508.1 517.0
Valuation allowance (43.7) (43.8)
Net deferred tax asset 464.4 473.2
Net deferred tax liabilities $ (1,137.2) $ (1,148.3)