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Summary of Significant Accounting Policies, Part 3 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Environmental Costs [Abstract]        
Environmental reserves - current portion $ 3.0 $ 3.8    
Asset Impairment Charges [Abstract]        
Impairment of property, plant and equipment 217.7 589.8 $ 51.1  
Impairment of goodwill 0.0 296.3 0.0  
Impairment charges in operating costs and expenses 232.6 890.6 132.7  
Total asset impairment charges 232.8 890.6 132.8  
Lease Accounting Standard [Abstract]        
Right-of-use assets [1] 345.6      
Lease liabilities [2] 375.1      
Environmental Reserves [Member]        
Movement in valuation allowances and reserves [Roll Forward]        
Balance at beginning of period 4.5 7.2 6.9  
Charged to costs and expenses 5.5 6.2 12.3  
Acquisition-related additions and other 1.3 2.6 2.5  
Deductions (7.6) (11.5) (14.5)  
Balance at end of period 3.7 4.5 7.2  
Operating costs and expenses [Member]        
Asset Impairment Charges [Abstract]        
Impairment of property, plant and equipment 217.7 589.8 51.0  
Impairment of investment in unconsolidated affiliate 0.0 0.0 76.4  
Impairment of goodwill 0.0 296.3 0.0  
Other impairments [3] 14.9 4.5 5.3  
Impairment charges in operating costs and expenses 232.6 890.6 132.7  
General and administrative costs [Member]        
Asset Impairment Charges [Abstract]        
Impairment of property, plant and equipment [4] $ 0.2 $ 0.0 $ 0.1  
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, 2021, lease liabilities of $36.3 million and $338.8 million were included within “Other current liabilities” and “Other long-term 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.