Deferred Tax Liabilities and Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Tax Liabilities:
Lease Financing	$ 272.6	$ 388.6	$ 392.0
Software Development	339.9	316.1	299.0
Accumulated Depreciation	20.6	24.1	22.0
Compensation and Benefits	70.7	63.5	112.2
State Taxes, net	48.8	62.3	63.3
Other Liabilities	169.1	157.5	104.0
Gross Deferred Tax Liabilities	921.7	1,012.1	992.5
Deferred Tax Assets:
Allowance for Credit Losses	81.7	103.5	107.8
Other Assets	185.0	126.7	85.0
Gross Deferred Tax Assets	266.7	230.2	192.8
Valuation Reserve	(1.6)	(3.9)	(3.9)
Deferred Tax Assets, net of Valuation Reserve	265.1	226.3	188.9
Net Deferred Tax Liabilities	$ (656.6)	$ (785.8)	$ (803.6)