XML 105 R85.htm IDEA: XBRL DOCUMENT v3.20.2
Commitments And Contingencies (Narrative) (Details)
$ in Millions
12 Months Ended
Sep. 30, 2020
USD ($)
Site Contingency [Line Items]  
Estimate minimum liability for environmental remediation $ 6.4
Future purchase obligation first year 181.9
Future purchase obligation second year 111.3
Future purchase obligation third year 120.9
Future purchase obligation fourth year 129.3
Future purchase obligation fifth year 146.3
Future purchase obligation thereafter 1,128.2
Former Manufactured Gas Plant Site New York [Member]  
Site Contingency [Line Items]  
Estimate minimum liability for environmental remediation $ 3.4
Environmental Site Remediation Costs [Member]  
Site Contingency [Line Items]  
Rate recovery period 2 years
Pipeline And Storage, Gathering And Utility Segments [Member]  
Site Contingency [Line Items]  
Contract commitments first year $ 98.3
Contract commitments second year 6.4
Contract commitments third year 3.4
Contract commitments fourth year 3.3
Contract commitments fifth year 3.3
Contract commitments thereafter 10.3
Exploration And Production [Member]  
Site Contingency [Line Items]  
Contract commitments first year 109.3
Contract commitments second year 15.2
Contract commitments third year $ 0.7