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Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jul. 16, 2014
Significant Accounting Policies [Line Items]      
Investment in unconsolidated business $ 9,000,000 $ 8,000,000  
Commercial paper, at carrying value 40,000,000 0  
Inventory net, held for sale 15,000,000 13,000,000  
Inventory net, materials and supplies $ 16,000,000 16,000,000  
Weighted average remaining life of deferred financing costs P5Y3M18D    
Accrued expenses $ 86,000,000 86,000,000  
IMTT      
Significant Accounting Policies [Line Items]      
Investment in unconsolidated business $ 9,000,000 $ 8,000,000  
Minimum      
Significant Accounting Policies [Line Items]      
Debt issuance costs amortized period 4 years    
Minimum | Buildings      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 20 years    
Minimum | Leaseholds and Leasehold Improvements      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 8 years    
Minimum | Machinery and equipment      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 3 years    
Maximum      
Significant Accounting Policies [Line Items]      
Debt issuance costs amortized period 12 years    
Maximum | Buildings      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 30 years    
Maximum | Leaseholds and Leasehold Improvements      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 30 years    
Maximum | Machinery and equipment      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 30 years    
IMTT Acquisition      
Significant Accounting Policies [Line Items]      
Equity interest acquired     20.00%
MIC Hawaii | Buildings      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 68 years    
MIC Hawaii | Leaseholds and Leasehold Improvements      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 68 years    
MIC Hawaii | Machinery and equipment      
Significant Accounting Policies [Line Items]      
Property, plant and equipment, useful life 68 years