Liabilities For Outstanding Claims, Losses And Loss Adjustment Expenses (Tables)

3 Months Ended

Mar. 31, 2018

Insurance [Abstract]

Schedule of Liability for Unpaid Losses and Loss Adjustment Expenses

The table below provides a reconciliation of the gross beginning and ending reserve for unpaid losses and loss adjustment expenses.

	Three Months Ended
	March 31,
(in millions)	2018			2017
Gross loss and LAE reserves, beginning of period	$	7,745.0		$	6,949.4
Reinsurance recoverable on unpaid losses		2,608.4			2,274.8
Net loss and LAE reserves, beginning of period		5,136.6			4,674.6
Net incurred losses and LAE in respect of losses occurring in:
Current year		803.7			773.9
Prior years		(17.9	)		(7.4	)
Total incurred losses and LAE		785.8			766.5
Net payments of losses and LAE in respect of losses    occurring in:
Current year		187.2			167.1
Prior years		537.4			452.3
Total payments		724.6			619.4
Effect of foreign exchange rate changes		13.2			7.4
Net reserve for losses and LAE, end of period		5,211.0			4,829.1
Reinsurance recoverable on unpaid losses		2,308.2			2,273.9
Gross reserve for losses and LAE, end of period	$	7,519.2		$	7,103.0