Goodwill and Other Intangibles (Other Intangible Assets Subject to Amortization and Capitalized Software) (Detail) - Software, In-Development, Internally Developed, and Purchased - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Intangible Asset, Finite-Lived, Acquired [Line Items]
Gross Carrying Amount	$ 5,084.3	$ 4,926.2
Less: Accumulated Amortization	2,873.4	2,574.2
Net Book Value	$ 2,210.9	$ 2,352.0