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Other Noncurrent Assets (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Identifiable intangible assets (net of accumulated amortization of $296.4 million, $258.0 million, and $286.9 million, respectively) $ 509,844,000 $ 534,044,000 $ 518,190,000
Deferred income taxes 71,157,000 62,674,000 72,682,000
Identifiable intangible assets, accumulated amortization 296,400,000 258,000,000.0 $ 286,900,000
Impairment of intangible assets $ 0 $ 0