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Summary of Significant Accounting Policies, Part 3 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Environmental Costs [Abstract]      
Environmental reserves - current portion $ 3.8 $ 5.8  
Asset Impairment Charges [Abstract]      
Impairment of property, plant and equipment 589.8 51.1 $ 46.8
Impairment of goodwill 296.3 0.0 0.0
Impairment charges in operating costs and expenses 890.6 132.7 50.5
Total asset impairment charges 890.6 132.8 50.5
Lease Accounting Standard [Abstract]      
Right-of-use assets [1] 332.0    
Lease liabilities [2] 348.6    
Environmental Reserves [Member]      
Movement in valuation allowances and reserves [Roll Forward]      
Balance at beginning of period 7.2 6.9 11.6
Charged to costs and expenses 6.2 12.3 8.2
Acquisition-related additions and other 2.6 2.5 1.7
Deductions (11.5) (14.5) (14.6)
Balance at end of period 4.5 7.2 6.9
Operating costs and expenses [Member]      
Asset Impairment Charges [Abstract]      
Impairment of property, plant and equipment 589.8 51.0 46.8
Impairment of investment in unconsolidated affiliate 0.0 76.4 0.0
Impairment of goodwill 296.3 0.0 0.0
Other impairments [3] 4.5 5.3 3.7
Impairment charges in operating costs and expenses 890.6 132.7 50.5
General and administrative costs [Member]      
Asset Impairment Charges [Abstract]      
Impairment of property, plant and equipment [4] $ 0.0 $ 0.1 0.0
ASC 842 [Member]      
Lease Accounting Standard [Abstract]      
Right-of-use assets     246.1
Lease liabilities     $ 246.1
[1] ROU asset amounts are a component of “Other assets” on our Consolidated Balance Sheet.
[2] At December 31, 2020, lease liabilities of $27.8 million and $320.8 million were included within “Other current liabilities” and “Other liabilities,” respectively.
[3]
Primarily represents the write-down of surplus materials classified as current assets and intangible assets other than goodwill.
[4] Amounts presented are reflected in general and administrative costs.