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Derivatives and Hedging Activities - Hedges and Credit Risk (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Cash Flow Hedges          
Longest period of time over which the entity hedges exposure to the variability in future cash flows     11 years    
Net Investment Hedges          
Gain (loss) on net investment hedges recognized in OCI $ 1.0 $ (1.0) $ 1.0 $ (3.0)  
Credit Risk          
Aggregate fair value of derivative contracts in net liability position containing credit contingent provisions 98.0   98.0   $ 65.0
Aggregate fair value of assets posted as collateral 88.0   88.0   58.0
Aggregate fair value of additional assets required to be posted or needed to settle $ 10.0   10.0   $ 7.0
Interest and debt expense          
Cash Flow Hedges          
Gain (loss) related to cash flow hedges in AOCI that will be reclassified to earnings within next twelve months     $ 0.8