Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Aggregate Minimum Payments under Operating Leases with Initial or Remaining Terms of More Than One Year

The aggregate minimum payments under operating leases with initial or remaining terms of more than one year as of December 31, 2016 were as follows:

Year	Aggregate Minimum Lease Payments
	($ in millions)
2017	$	37.2
2018		35.0
2019		31.3
2020		27.6
2021		25.0
2022 and thereafter		119.3

Asbestos Related Illnesses and Environmental Impairment Loss and Loss Adjustment Expense Reserves

Loss and LAE include amounts for risks relating to asbestos-related illness and environmental impairment. As of December 31, 2016 and 2015, such gross and net reserves were as follows:

	December 31, 2016				December 31, 2015
	Gross		Net		Gross		Net
	($ in millions)
TransRe	$	165.7	$	160.0	$	174.9	$	168.4
CapSpecialty		6.3		6.3		8.7		8.6
Total	$	172.0	$	166.3	$	183.6	$	177.0