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Reinsurance (Cumulative Paid Claims) (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | $ 173.7 |  |  |  |
Incident Year 2012 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 34.9 | $ 34.9 | $ 34.9 | $ 34.8 | $ 33.3
Incident Year 2013 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 40.8 | 40.8 | 40.8 | $ 38.9 |
Incident Year 2014 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 39.9 | 39.9 | $ 38.3 |  |
Incident Year 2015 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 33.4 | $ 31.9 |  |  |
Incident Year 2016 [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | $ 24.7 |  |  |  |

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