Basis of Presentation (Details) (Investments denominated in functional currencies incorrectly translated, USD $) In Millions	3 Months Ended
	Mar. 31, 2010
Amortized cost or cost of available for sale investments
Correction of Amortized Cost or Cost
Quantifying misstatement in current year financial statements amount	$ 98.1
Amortized cost or cost of available for sale investments | Fixed maturities
Correction of Amortized Cost or Cost
Quantifying misstatement in current year financial statements amount	80.1
Amortized cost or cost of available for sale investments | Equities
Correction of Amortized Cost or Cost
Quantifying misstatement in current year financial statements amount	18.0
Accumulated other comprehensive income total net unrealized appreciation of investments adjustments
Correction of Amortized Cost or Cost
Quantifying misstatement in current year financial statements amount	63.7
Other Comprehensive income total net unrealized appreciation of investments adjustments
Correction of Amortized Cost or Cost
Quantifying misstatement in current year financial statements amount	63.7
Accumulated other comprehensive income foreign currency translations adjustment
Correction of Amortized Cost or Cost
Quantifying misstatement in current year financial statements amount	(63.7)
Other comprehensive income foreign currency translations adjustment
Correction of Amortized Cost or Cost
Quantifying misstatement in current year financial statements amount	$ (63.7)