Reserves for Unpaid Losses and Loss Adjustment Expenses (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013	Dec. 31, 2012
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross beginning balance	$ 1,054.3		$ 1,000.0
Less beginning reinsurance recoverable on unpaid losses	(80.2)		(107.3)
Loss and LAE incurred relating to Current year losses	150.8		151.8
Loss and LAE incurred relating to prior year losses	(1.4)		(2.9)
Total incurred loss and LAE from continuing operations	149.4		148.9
Loss and LAE paid relating to Current year losses	(18.3)		(19.8)
Loss and LAE paid relating to Prior year losses	(115.5)		(117.3)
Total loss and LAE payments from continuing operations	(133.8)		(137.1)
Net loss and LAE reserves	989.7		904.5
Total incurred loss and LAE from discontinued operations	0		0
Total loss and LAE payments from discontinued operations	(11.1)		(45.7)
Net loss and LAE reserves	978.6		858.8
Net change in loss and LAE reserves reported in liabilities held for sale	11.1	[1]	45.7	[2]
Net ending loss and LAE reserves	989.7		904.5		974.1	892.7
Plus ending reinsurance recoverable on unpaid losses	80.1		105.8
Gross ending balance	1,069.8		1,010.3
Runoff
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Net ending loss and LAE reserves					177.3
Loss and Loss Adjustment Expense Reserves Reclassified to from Held For Sale	$ (177.3)		$ (166.1)		$ 188.4	$ 211.8

[1] Consists of the change in net loss and LAE reserves to $177.3 million from $188.4 million, which amounts were classified as held for sale as of March 31, 2014 and December 31, 2013, respectively, in connection with the Runoff Transaction.

[2] Consists of the change in net loss and LAE reserves to $166.1 million from $211.8 million, which amounts were classified as held for sale as of March 31, 2013 and December 31, 2012, respectively, in connection with the Runoff Transaction.