Comprehensive Income - Reclassifications from Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Net realized loss	$ (3.8)	$ (5.1)	$ (11.8)	$ (15.8)
Reclassifications from Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassifications before tax	(0.0)	0.6	0.7	1.7
Income tax benefit	(0.0)	0.2	0.2	0.5
Reclassifications, net of tax	(0.0)	0.4	0.5	1.2
Reclassifications from Accumulated Other Comprehensive Loss | Interest Rate Collars: Net Realized Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Net realized loss	$ (0.0)	$ 0.6	$ 0.7	$ 1.7