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Reinsurance Prepaid Reinsurance Premiums and Reinsurance Recoverables (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 203.3	$ 170.5
Percentage Of Total Prepaid Reinsurance Premiums	100.00%	100.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 2,273.4	$ 1,884.8
Percentage Of Total Reinsurance Recoverables	100.00%	100.00%
State Reinsurance Plans [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 179.9	$ 153.4
Percentage Of Total Prepaid Reinsurance Premiums	88.00%	90.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 2,060.7	$ 1,772.3
Percentage Of Total Reinsurance Recoverables	91.00%	94.00%
State Reinsurance Plans [Member] | Michigan Catastrophic Claims Association [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 44.3	$ 36.5
Percentage Of Total Prepaid Reinsurance Premiums	22.00%	21.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 1,611.5	$ 1,452.7
Percentage Of Total Reinsurance Recoverables	71.00%	77.00%
State Reinsurance Plans [Member] | Commercial Auto Insurance Procedures Plans [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 50.0	$ 40.2
Percentage Of Total Prepaid Reinsurance Premiums	25.00%	24.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 218.0	$ 170.6
Percentage Of Total Reinsurance Recoverables	10.00%	9.00%
State Reinsurance Plans [Member] | North Carolina Reinsurance Facility [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 31.5	$ 27.5
Percentage Of Total Prepaid Reinsurance Premiums	15.00%	16.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 74.2	$ 67.0
Percentage Of Total Reinsurance Recoverables	3.00%	4.00%
State Reinsurance Plans [Member] | other reinsurance program [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 0.3	$ 0.1
Percentage Of Total Prepaid Reinsurance Premiums	0.00%	0.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 8.2	$ 3.5
Percentage Of Total Reinsurance Recoverables	0.00%	0.00%
Federal Reinsurance Plans [Member] | National Flood Insurance Program [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 53.8	$ 49.1
Percentage Of Total Prepaid Reinsurance Premiums	26.00%	29.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 148.8	$ 78.5
Percentage Of Total Reinsurance Recoverables	7.00%	4.00%
Non State Reinsurance Plans [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 23.4	$ 17.1
Percentage Of Total Prepaid Reinsurance Premiums	12.00%	10.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 212.7	$ 112.5
Percentage Of Total Reinsurance Recoverables	9.00%	6.00%
Property reinsurance program [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 9.1	$ 3.2
Percentage Of Total Prepaid Reinsurance Premiums	5.00%	2.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 138.6	$ 62.9
Percentage Of Total Reinsurance Recoverables	6.00%	3.00%
other reinsurance program [Member]
Reinsurance Premiums for Insurance Companies, by Product Segment [Line Items]
Prepaid reinsurance premiums	$ 14.3	$ 13.9
Percentage Of Total Prepaid Reinsurance Premiums	7.00%	8.00%
Reinsurance Recoverables, Including Reinsurance Premium Paid	$ 74.1	$ 49.6
Percentage Of Total Reinsurance Recoverables	3.00%	3.00%

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The unexpired portion of premiums ceded on policies in force as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 340
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6485982&loc=d3e22818-158507

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 20
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6480758&loc=d3e6824-158387

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 310
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6485522&loc=d3e21409-158489

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.(a),6)
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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