Annual report pursuant to Section 13 and 15(d)

GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details)

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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]              
Goodwill, impairment loss   $ 0 $ 0 $ 0      
Impairment of Indefinite-lived Intangible assets $ 0            
Amortization expense related to purchased intangible assets         $ 176,400,000 $ 141,800,000 $ 140,100,000
Indefinite lived intangibles         $ 94,900,000 $ 94,900,000