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Other Investments (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Investments in certain limited partnerships | $ 13.4 |
Other investments held |  | $ 0.0
Payments to acquire partnership interests | 0.7 |
Additional investment | $ 2.0 |
Certain Limited Partnerships | Minimum |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Partnership interest (as a percentage) | 3.00% |
Certain Limited Partnerships | Maximum |  |
Equity Securities without Readily Determinable Fair Value [Line Items] |  |
Partnership interest (as a percentage) | 5.00% |

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