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Income Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Income Tax Disclosure [Abstract]        
Effective income tax rate (in percent) 22.10% 31.80% 21.10% 26.30%
Benefits that resulted from equity incentive awards     $ 34.0 $ 22.7
Loss from mark-to-market adjustment on investment   $ 26.5   $ 76.5
Realized gain (loss) on Starry $ (91.5)      
Valuation allowance release on Starry 22.7      
Total amount of unrecognized tax benefits relating to uncertain tax positions 49.3   49.3  
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions     7.7  
Increase in reserves for uncertain tax positions expected to be taken in current year     7.7  
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months $ 11.9   $ 11.9