Goodwill and Other Intangibles (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Other Intangible Assets
Intangible Asset, Finite-Lived, Acquired [Line Items]
Other intangible assets	$ 58.0		$ 58.0		$ 59.6
Software, In-Development, Internally Developed, and Purchased
Intangible Asset, Finite-Lived, Acquired [Line Items]
Other intangible assets	2,210.9		2,210.9		$ 2,352.0
Amortization expense	173.5	$ 168.0	346.4	$ 330.9
Loss on disposal of capitalized software	$ 61.5		$ 61.5