Offsetting of Assets and Liabilities (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Offsetting Assets and Liabilities [Line Items]
Collateral received	$ 10.2	$ 2.7
Gross amounts not offset in the balance sheet	0.0	0.0
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position	416.9	306.7
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position	296.1	299.1
Net maximum amount of termination payments that could have been required	120.8	7.6
Net Investment Hedges
Offsetting Assets and Liabilities [Line Items]
Collateral received	121.5
Gross amounts not offset in the balance sheet	$ 254.1
Cash collateral received from derivative counterparties and not offset against derivative assets		420.8
Cash collateral deposited with derivative counterparties not offset against derivative liabilities		$ 144.1