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Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accounting Policies [Abstract] |  |  |
Percentage of ownership in Swiss franchise | 49.00% |  |
Swiss franchise investment portfolio market value | $ 202.3 | $ 200.9 |
Swiss franchise realized gains | 2.3 | 2.5 | $ 3.6
Swiss franchise realized losses | 1.1 | 0.5 | 1.4
Other-than-temporary impairment (gain) loss | $ (0.2) | $ 0.1 | $ (0.9)

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