Other Income (Disaggregation of Revenue) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Other income	$ 18.4	$ 20.9
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	14.0
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	4.4
Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	14.0
Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	4.4
Ancillary Product Profit Sharing [Member]
Disaggregation of Revenue [Line Items]
Other income	9.1	8.7
Ancillary Product Profit Sharing [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	9.1
Ancillary Product Profit Sharing [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0
Ancillary Product Profit Sharing [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	9.1
Ancillary Product Profit Sharing [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0
Interest [Member]
Disaggregation of Revenue [Line Items]
Other income	4.8	8.4
Interest [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	4.8
Interest [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0
Interest [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	4.8
Interest [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0
Remarketing Fees [Member]
Disaggregation of Revenue [Line Items]
Other income	4.1	3.4
Remarketing Fees [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0
Remarketing Fees [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	4.1
Remarketing Fees [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.0
Remarketing Fees [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	4.1
Other [Member]
Disaggregation of Revenue [Line Items]
Other income	0.4	$ 0.4
Other [Member] \| Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.1
Other [Member] \| Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Other income	0.3
Other [Member] \| Third Party Providers [Member]
Disaggregation of Revenue [Line Items]
Other income	0.1
Other [Member] \| Dealers [Member]
Disaggregation of Revenue [Line Items]
Other income	$ 0.3