Background and Summary of Significant Accounting Policies - Revenue Recognition (Details)	12 Months Ended
	Dec. 31, 2025
Minimum
Disaggregation of Revenue [Line Items]
Contract term	1 year
Maximum
Disaggregation of Revenue [Line Items]
Contract term	5 years
Customer relationship period for revenue recognition	20 years
Average | Mass Markets
Disaggregation of Revenue [Line Items]
Customer life	47 months
Average | Business
Disaggregation of Revenue [Line Items]
Customer life	34 months