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Investment Securities (Details 2) $ in Millions | Mar. 31, 2019 USD ($) securities | Dec. 31, 2018 USD ($) securities
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Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | securities | 0 | 2
Number of securities, 12 months or more | securities | 26 | 29
Number of securities, total | securities | 26 | 31
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 0.0 | $ 224.0
Estimated Fair Value, 12 months or more | 1,050.0 | 873.0
Estimated Fair Value, Total | 1,050.0 | 1,097.0
Available For Sale Securities Continuous Unrealized Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 Months | 0.0 | (2.0)
Gross Unrealized Losses, 12 months or more | (10.0) | (16.0)
Gross Unrealized Losses, Total | $ (10.0) | $ (18.0)
Ratio Of Fair Value To Amortized Cost Between Ninety And One Hundred Percent [Member] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | securities | 0 | 2
Number of securities, 12 months or more | securities | 26 | 29
Number of securities, total | securities | 26 | 31
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 0.0 | $ 224.0
Estimated Fair Value, 12 months or more | 1,050.0 | 873.0
Estimated Fair Value, Total | 1,050.0 | 1,097.0
Available For Sale Securities Continuous Unrealized Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 Months | 0.0 | (2.0)
Gross Unrealized Losses, 12 months or more | (10.0) | (16.0)
Gross Unrealized Losses, Total | $ (10.0) | $ (18.0)

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