Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value Disclosures [Abstract]

Fair value hierarchy for financial assets and liabilities

The following tables present the Company's fair value hierarchy for financial assets and liabilities measured as of December 31, 2021 and 2020 ($ in millions):

	December 31, 2021
	Level 1		Level 2		Level 3		Total
Assets:
Corporate debt securities	$	—	$	588.7	$	—	$	588.7
U.S. Government obligations	—		101.5		—		101.5
Municipal securities	—		1.2		—		1.2
Fixed maturities	—		691.4		—		691.4
Short term investments	—		110.4		—		110.4
Total	$	—	$	801.8	$	—	$	801.8

	December 31, 2020
	Level 1		Level 2		Level 3		Total
Assets:
Corporate debt securities	$	—	$	—	$	—	—
U.S. Government obligations	—		6.6		—		6.6
Municipal securities	—		—		—		—
Fixed maturities	—		6.6		—		6.6
Short term investments	—		—		—		—
Total	$	—	$	6.6	$	—	$	6.6