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Investment Securities (Details 2) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) securities | Dec. 31, 2017 USD ($) securities
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions [Abstract] |  |
Number of securities, less than 12 months | securities | 31 | 34
Number of securities, 12 months or more | securities | 8 | 13
Number of securities, total | securities | 39 | 47
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 1,592.0 | $ 807.0
Estimated Fair Value, 12 months or more | 195.0 | 211.0
Estimated Fair Value, Total | 1,787.0 | 1,018.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (22.0) | (6.0)
Gross Unrealized Losses, 12 months or more | (9.0) | (8.0)
Gross Unrealized Losses, Total | $ (31.0) | $ (14.0)
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 | 31 | 34
Number of securities, 12 months or more | securities | 8 | 13
Number of securities, total | securities | 39 | 47
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Estimated Fair Value, Less than 12 months | $ 1,592.0 | $ 807.0
Estimated Fair Value, 12 months or more | 195.0 | 211.0
Estimated Fair Value, Total | 1,787.0 | 1,018.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Losses [Abstract] |  |
Gross Unrealized Losses, Less than 12 months | (22.0) | (6.0)
Gross Unrealized Losses, 12 months or more | (9.0) | (8.0)
Gross Unrealized Losses, Total | $ (31.0) | $ (14.0)

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