SCHEDULE II CONDENSED FINANCIAL INFORMATION OF THE REGISTRANT (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash	$ 373.2	$ 382.8
Fixed maturity investments, at fair value	4,784.3	5,030.5
Short-term investments, at amortized cost	871.7	635.9
Other assets	356.1	437.4
Total assets	10,456.9	12,144.3
Liabilities
Debt	746.6	676.4
Other liabilities	341.0	415.7
Total liabilities	5,917.3	7,746.9
White Mountains’s common shareholders’ equity	4,539.6	4,397.4
Total liabilities and equity	10,456.9	12,144.3
White Mountains Insurance Group Ltd.
Assets
Cash	0.2	0.2
Fixed maturity investments, at fair value	0	31.8
Short-term investments, at amortized cost	31.0	1.4
Other assets	0.2	0.4
Investments in consolidated and unconsolidated affiliates	4,119.4	3,919.1
Total assets	4,150.8	3,952.9
Liabilities
Debt	0	0
Payable to subsidiary	161.6	47.0
Other liabilities	(7.4)	0.4
Total liabilities	154.2	47.4
White Mountains’s common shareholders’ equity	3,996.6	3,905.5
Total liabilities and equity	$ 4,150.8	$ 3,952.9