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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:      
Exit costs, environmental and other similar items $ 83.5 $ 84.5 $ 50.2
Employee related and benefit items 129.3 97.0 104.1
Operating lease liabilities 430.6    
Other items 204.0 161.6 113.2
Total deferred tax assets 847.4 343.1 267.5
Deferred tax liabilities:      
Depreciation and amortization 1,232.6 1,303.6 1,506.7
LIFO inventories 80.5 64.5 66.5
Operating lease right-of-use assets 417.8    
Other items 28.1 29.5 49.7
Total deferred tax liabilities 1,759.0 1,397.6 1,622.9
Net deferred tax liabilities $ 911.6 $ 1,054.5 $ 1,355.4