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Investment Securities (Fair Value of Hedge Funds and Private Equity Funds) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Hedge and private equity funds included in other long-term investments    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments $ 151.6 $ 125.3
Unfunded Commitments 131.0 58.1
Hedge funds | Hedge Fund, Long/ Short Equity Banks and Financial    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 59.6 54.9
Unfunded Commitments 0.0 0.0
Hedge funds | Hedge funds    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 59.6 54.9
Unfunded Commitments 0.0 0.0
Private equity security | Industrial    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 49.6 43.3
Unfunded Commitments 10.5 10.4
Private equity security | Aerospace Defense Government    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 25.5 15.8
Unfunded Commitments 34.9 12.9
Private equity security | Direct Lending    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 10.6 7.1
Unfunded Commitments 19.9 23.1
Private equity security | Financial Services Sector    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 6.3 4.2
Unfunded Commitments 15.7 11.7
Private equity security | Private equity security    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 92.0 70.4
Unfunded Commitments 131.0 58.1
Private equity security | Real estate    
Debt and Equity Securities, FV-NI [Line Items]    
Other long-term investments 0.0 0.0
Unfunded Commitments $ 50.0 $ 0.0