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Segments - Information Concerning Principal Geographic Areas for Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Revenue:      
Revenues $ 4,357.0 $ 4,475.5 $ 5,070.8
United States      
Revenue:      
Revenues 1,507.9 1,575.1 1,702.0
International      
Revenue:      
Revenues $ 2,849.1 $ 2,900.4 $ 3,368.8