New Accounting Pronouncements (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Jan. 01, 2019 USD ($) landeasements
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impairment Losses Recorded Upon Adoption of Topic 842		$ 0
Number of Land Easements Treated As Leases | landeasements		0
Impact on Total Capital Lease Expense of ASC Topic 842 Adoption		$ 0
Maximum | Subsequent event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected balance sheet impact of new lease standard	$ 60,000,000
Minimum | Subsequent event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected balance sheet impact of new lease standard	$ 40,000,000