Financing and Other Debt - Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) agreement securitized_debt_agreement	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Number of securitized debt agreements | securitized_debt_agreement	2
Short term debt	$ 723,000,000.0	$ 202,600,000
Accounts receivable pledged as collateral	3,622,300,000	3,275,700,000
Asset Pledged as Collateral | Mobility
Debt Instrument [Line Items]
Accounts receivable pledged as collateral	236,200,000
Line of Credit
Debt Instrument [Line Items]
Short term debt	$ 20,000,000	$ 0
Convertible Senior Notes Due 2027 | Convertible Debt
Debt Instrument [Line Items]
Effective interest rate on the liability component (as a percent)	7.50%	7.50%
Unamortized debt issuance expense	$ 11,400,000	$ 12,700,000
Debt instrument, unamortized discount	11,400,000	12,700,000
Participation debt
Debt Instrument [Line Items]
Short term debt	$ 53,900,000	$ 39,000,000.0
Interest rate during period (as a percent)	7.48%	6.64%
Borrowed federal funds
Debt Instrument [Line Items]
Short term debt	$ 520,200,000	$ 0
Interest rate during period (as a percent)	5.39%	0.00%
Borrowed federal funds | Federal Reserve Bank Advances
Debt Instrument [Line Items]
Short term debt	$ 500,000,000
Interest rate during period (as a percent)	5.39%
Borrowed federal funds | Federal Reserve Bank Advances | Asset Pledged as Collateral
Debt Instrument [Line Items]
Debt securities, par value	$ 575,100,000
Fair value of debt securities pledged	518,400,000
Revolving Credit Facility | Federal Reserve Bank
Debt Instrument [Line Items]
Current borrowing capacity	182,200,000
Letters of credit	0	$ 0
Revolving Credit Facility | Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Amounts available	$ 930,000,000
Participation Debt | Margin | Minimum | Line of Credit
Debt Instrument [Line Items]
Margin on variable rate, percent	2.25%	2.25%
Participation Debt | Margin | Maximum | Line of Credit
Debt Instrument [Line Items]
Margin on variable rate, percent	2.50%	2.50%
Participation Debt | Participation debt | Line of Credit
Debt Instrument [Line Items]
Number of outstanding participation agreements | agreement	3
Borrowings under guaranteed investment agreements	$ 70,000,000