Statements of Stockholders' Equity - USD ($) $ in Millions	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Common stock, shares issued		638,700,000
Stockholders' Equity, balance		$ 63.9	$ 486.4	$ 12,438.3	$ (7,104.8)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 230.2					$ 230.2
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax	(214.8)					(214.8)
NET EARNINGS	1,405.8		0.0		0.0	0.0
Stock Based Compensation Expense in Equity			79.2	0.0	0.0	0.0
Issuance relating to stock compensation plans			(148.3)	0.0	384.7	0.0
Tax benefit from stock compensation plans			39.6	0.0	0.0	0.0
Treasury Stock, Acquired			0.0	0.0	(646.5)	0.0
Dividend received from CDK Global, Inc.	0.0
Dividends, Stock			0.0	(823.8)	0.0	0.0
Common stock, shares issued		638,700,000
Stockholders' Equity, balance		$ 63.9	456.9	13,020.3	(7,366.6)
Accumulated Other Comprehensive Income (Loss), Net of Tax	15.4					15.4
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax	162.8					162.8
NET EARNINGS	1,515.9		0.0		0.0	0.0
Stock Based Compensation Expense in Equity			110.3	0.0	0.0	0.0
Issuance relating to stock compensation plans			(78.6)	0.0	314.5	0.0
Tax benefit from stock compensation plans			56.6	0.0	0.0	0.0
Treasury Stock, Acquired			0.0	0.0	(697.9)	0.0
Dividend received from CDK Global, Inc.	$ 0.0
Dividends, Stock			0.0	(903.3)	0.0	0.0
Common stock, shares issued	638,700,000.0	638,700,000
Stockholders' Equity, balance		$ 63.9	545.2	13,632.9	(7,750.0)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 178.2					178.2
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest			0.0	0.0	0.0
Other Comprehensive Income (Loss), Net of Tax	(350.6)					(350.6)
NET EARNINGS	1,452.5		0.0	1,452.5	0.0	0.0
Stock Based Compensation Expense in Equity			112.8	0.0	0.0	0.0
Issuance relating to stock compensation plans			(67.8)	0.0	243.0	0.0
Tax benefit from stock compensation plans			73.1	0.0	0.0	0.0
Treasury Stock, Acquired			0.0	0.0	(1,611.4)	0.0
Stockholders' Equity Note, Spinoff Transaction	(1,523.0)
Dividend received from CDK Global, Inc.	$ 825.0
Dividends, Stock			0.0	(927.1)	0.0	0.0
Common stock, shares issued	638,700,000.0	638,700,000
Stockholders' Equity, balance		$ 63.9	$ 663.3	$ 13,460.3	$ (9,118.4)
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (260.6)					$ (260.6)