Income Taxes - Deferred Tax Liabilities (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred Tax Liabilities:
Lease Financing	$ 36.9	$ 43.3
Software Development	249.4	193.2
Accumulated Depreciation	99.8	129.5
Compensation and Benefits	8.3	10.9
State Taxes, net	66.4	58.9
Other Liabilities	206.7	114.5
Gross Deferred Tax Liabilities	667.5	550.3
Deferred Tax Assets:
Allowance for Credit Losses	26.1	29.0
Other Assets	147.0	120.6
Gross Deferred Tax Assets	173.1	149.6
Valuation Reserve	(29.8)	(0.3)
Deferred Tax Assets, net of Valuation Reserve	143.3	149.3
Net Deferred Tax Liabilities	$ 524.2	$ 401.0