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Supplemental Disclosure of Cash Flow Information (Tables)
6 Months Ended
Jun. 30, 2023
Supplemental Cash Flow Elements [Abstract]  
Supplemental Disclosure of Cash Flow Information Supplemental Disclosure of Cash Flow Information (in millions):
 For the
Six Months Ended
June 30,
 20232022
Cash paid during the period for:  
Interest (net of amount capitalized)$74.1 $73.8 
Non-cash investing activities:
Accounts payable and property, plant and equipment30.5 32.3 
Right-of-use asset obtained in exchange for lease obligations1.0 — 
Gas stored underground and property, plant and equipment47.8 —