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Other Noncurrent Assets (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]          
Identifiable intangible assets (net of accumulated amortization of $306.0 million, $267.7 million, and $286.9 million, respectively) $ 500,811,000 $ 524,153,000 $ 500,811,000 $ 524,153,000 $ 518,190,000
Deferred income taxes 73,744,000 59,827,000 73,744,000 59,827,000 72,682,000
Identifiable intangible assets, accumulated amortization 306,000,000.0 267,700,000 306,000,000.0 267,700,000 $ 286,900,000
Impairment of intangible assets $ 0 $ 0 $ 0 $ 0