Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Other income	$ 18.9	$ 17.6	$ 58.8	$ 50.7
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	15.2		47.8
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	3.7		11.0
Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	15.3		47.8
Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	3.6		11.0
Ancillary Product Profit Sharing [Member]
Disaggregation of Revenue [Line Items]
Other income	9.5	8.0	25.7	21.7
Ancillary Product Profit Sharing [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	9.5		25.7
Ancillary Product Profit Sharing [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0		0.0
Ancillary Product Profit Sharing [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	9.5		25.7
Ancillary Product Profit Sharing [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0		0.0
Interest [Member]
Disaggregation of Revenue [Line Items]
Other income	5.7	6.4	21.9	18.6
Interest [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	5.7		21.9
Interest [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0		0.0
Interest [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	5.7		21.9
Interest [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0		0.0
Remarketing Fees [Member]
Disaggregation of Revenue [Line Items]
Other income	3.4	2.9	10.1	9.1
Remarketing Fees [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0		0.0
Remarketing Fees [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	3.4		10.1
Remarketing Fees [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0		0.0
Remarketing Fees [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	3.4		10.1
Other [Member]
Disaggregation of Revenue [Line Items]
Other income	0.3	$ 0.3	1.1	$ 1.3
Other [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0		0.2
Other [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.3		0.9
Other [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.1		0.2
Other [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	$ 0.2		$ 0.9