Revenues from Contracts - Contract Balances (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Revenue from Contract with Customer [Abstract]
Unbilled receivables	$ 112.1	$ 91.5
Change in unbilled receivables	20.6
Deferred revenue – current	(1,496.7)	(1,370.7)
Change in deferred revenue - current	(126.0)
Deferred revenue - non-current	(127.6)	(111.5)
Change in deferred revenue - non-current	(16.1)
Net contract assets/(liabilities)	(1,512.2)	$ (1,390.7)
Change in net contract assets/(liabilities)	$ (121.5)