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Goodwill and Other Intangible Assets	12 Months Ended
Goodwill and Other Intangible Assets	Dec. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Other Intangible Assets	Substantially all of our goodwill relates to the excess of cost over the fair value of the net assets acquired in the Columbia acquisition on November 1, 2000. Our goodwill balance was $1,485.9 million as of December 31, 2024 and 2023. The majority of our goodwill has been allocated to the Columbia Operations segment. For our annual goodwill impairment analysis performed as of May 1, 2024, we completed a quantitative ("step 1") fair value measurement of our reporting units. Fair value of our reporting units was determined based on a weighting of income and market approaches. The income approach calculated discounted cash flows using updated cash flow projections, discount rates and return on equity assumptions. The market approach applied a combination of comparable company multiples and comparable transactions and used the most recent cash flow projections. The test indicated that the fair value of each of the reporting units that are allocated goodwill exceeded their carrying values, indicating that no impairment was necessary.