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Commitments and Contingencies, Operating Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating Leases [Abstract]    
ROU asset carrying value [1] $ 210.2  
Lease liability carrying value [2] 212.0  
Lease liability, current $ 40.4  
Lease liability, current, Consolidated Balance Sheet line item us-gaap:OtherLiabilitiesCurrent  
Lease liability, noncurrent $ 171.6 $ 0.0
Lease liability, noncurrent, Consolidated Balance Sheet line item us-gaap:OtherLiabilitiesNoncurrent  
Cash payments for operating lease liabilities $ 48.1  
Storage and Pipeline Facilities [Member]    
Operating Leases [Abstract]    
ROU asset carrying value [1] 137.9  
Lease liability carrying value [2] $ 138.6  
Weighted-average remaining term 16 years  
Weighted-average discount rate [3] 4.30%  
Transportation Equipment [Member]    
Operating Leases [Abstract]    
ROU asset carrying value [1] $ 49.9  
Lease liability carrying value [2] $ 52.4  
Weighted-average remaining term 3 years  
Weighted-average discount rate [3] 3.50%  
Office Building and Warehouse Space [Member]    
Operating Leases [Abstract]    
ROU asset carrying value [1] $ 22.4  
Lease liability carrying value [2] $ 21.0  
Weighted-average remaining term 2 years  
Weighted-average discount rate [3] 3.40%  
[1] ROU asset amounts are a component of “Other assets” on our consolidated balance sheet.
[2] At December 31, 2019, lease liabilities of $40.4 million and $171.6 million were included within “Other current liabilities” and “Other liabilities,” respectively.
[3] The discount rate for each category of assets represents the weighted average of either (i) the implicit rate applicable to the underlying leases (where determinable) or (ii) our incremental borrowing rate adjusted for collateralization (if the implicit rate is not determinable).  In general, the discount rates are based on either (i) information available at the lease commencement date or (ii) January 1, 2019 for leases existing at the adoption date for ASC 842.