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Investment Securities - Unrealized Losses On Debt Securities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than one year $ 731.1 $ 587.5
Gross unrealized losses, less than one year 10.1 7.4
Fair value, one year or longer 1,555.6 1,277.5
Gross unrealized losses, one year or longer 120.0 96.9
Fair Value 2,286.7 1,865.0
Gross Unrealized Losses 130.1 104.3
U.S. treasury notes    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than one year 23.1 0.0
Gross unrealized losses, less than one year 0.2 0.0
Fair value, one year or longer 356.3 358.6
Gross unrealized losses, one year or longer 34.8 32.3
Fair Value 379.4 358.6
Gross Unrealized Losses 35.0 32.3
Corporate and sovereign debt securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than one year 342.5 132.7
Gross unrealized losses, less than one year 3.7 2.3
Fair value, one year or longer 526.6 482.9
Gross unrealized losses, one year or longer 31.6 29.3
Fair Value 869.1 615.6
Gross Unrealized Losses 35.3 31.6
Municipal bonds    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than one year 24.9 25.3
Gross unrealized losses, less than one year 0.5 0.2
Fair value, one year or longer 41.8 42.5
Gross unrealized losses, one year or longer 6.6 6.0
Fair Value 66.7 67.8
Gross Unrealized Losses 7.1 6.2
Asset-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than one year 51.3 55.0
Gross unrealized losses, less than one year 0.4 0.2
Fair value, one year or longer 78.9 131.1
Gross unrealized losses, one year or longer 2.4 4.0
Fair Value 130.2 186.1
Gross Unrealized Losses 2.8 4.2
Mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Fair value, less than one year 289.3 374.5
Gross unrealized losses, less than one year 5.3 4.7
Fair value, one year or longer 552.0 262.4
Gross unrealized losses, one year or longer 44.6 25.3
Fair Value 841.3 636.9
Gross Unrealized Losses $ 49.9 $ 30.0