Comprehensive Income - Reclassifications from Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Net realized loss	$ (3.4)	$ (5.0)	$ (8.0)	$ (10.7)
Reclassifications from Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Reclassifications before tax	0.1	0.5	0.7	1.1
Income tax benefit		0.1	0.2	0.3
Reclassifications, net of tax	0.1	0.4	0.5	0.8
Reclassifications from Accumulated Other Comprehensive Loss | Interest Rate Collars: Net Realized Loss
Accumulated Other Comprehensive Income Loss [Line Items]
Net realized loss	$ 0.1	$ 0.5	$ 0.7	$ 1.1