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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2018 | Jan. 01, 2015
Accounting Policies [Line Items] |  |  |  |
Cumulative effect of an accounting change |  |  | $ 12.2 | $ 43.9
Unrealized Gain on Securities |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Cumulative effect of an accounting change |  |  | $ (0.8) |
Other Expense [Member] | Accounting Standards Update 2017-07 [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification |  | $ 1.4 |  |
Minimum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |  |
Maximum [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Finite-Lived Intangible Asset, Useful Life | 25 years |  |  |
Subsidiaries [Member] |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Ownership Interest in Subsidiary | 100.00% |  |  |

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