Losses and Loss Expenses Payable Losses and Loss Expenses Payable (Tables)

3 Months Ended

Mar. 31, 2017

Losses and Loss Expenses Payable [Abstract]

Schedule Of Activity In Liability For Unpaid Losses And Loss Adjustment Expenses Table [Table Text Block]

($ millions)	2017			2016
Losses and loss expenses payable, at beginning of period	$	1,181.6		$	1,053.0
Less: reinsurance recoverable on losses and loss expenses payable	3.6			5.9
Net balance at beginning of period	1,178.0			1,047.1
Incurred related to:
Current year	243.7			215.4
Prior years	(9.7		)	9.6
Total incurred	234.0			225.0
Paid related to:
Current year	60.1			52.3
Prior years	139.4			142.8
Total paid	199.5			195.1
Net balance at end of period	1,212.5			1,077.0
Plus: reinsurance recoverable on losses and loss expenses payable	4.8			6.5
Losses and loss expenses payable, at end of period	$	1,217.3		$	1,083.5