Goodwill and Other Intangible Assets - Other Intangible Assets Subject to Amortization (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Intangible Asset, Goodwill and Other [Abstract]
Gross carrying amount	$ 3,846.4	$ 3,852.8
Accumulated amortization	(740.7)	(621.0)
Total	$ 3,105.7	$ 3,231.8