Goodwill and Other Intangibles (Other Intangible Assets Subject to Amortization and Capitalized Software) (Detail) - Computer Software - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Intangible Asset, Acquired, Finite-Lived [Line Items]
Gross Carrying Amount	$ 5,006.3	$ 4,926.2
Less: Accumulated Amortization	2,702.6	2,574.2
Net Book Value	$ 2,303.7	$ 2,352.0