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Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |  |
Percentage of ownership in Swiss franchise | 49.00% |  |
Swiss franchise investment portfolio market value | $ 219.9 | $ 234.8 |
Swiss franchise realized gains | 12.7 | 14.7 | $ 2.9
Swiss franchise realized losses | 2.1 | 3.8 | 1.0
Other-than-temporary impairment gains | $ 0.1 | $ 1.6 | $ 0.3

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