Summary of Significant Accounting Policies (Details) $ / shares in Units, shares in Millions		3 Months Ended								12 Months Ended
		Jun. 30, 2018 USD ($) $ / shares	Mar. 31, 2018 $ / shares	Dec. 31, 2017 $ / shares	Sep. 30, 2017 $ / shares	Jun. 30, 2017 USD ($) $ / shares	Mar. 31, 2017 $ / shares	Dec. 31, 2016 $ / shares	Sep. 30, 2016 $ / shares	Jun. 30, 2018 USD ($) $ / shares shares	Jun. 30, 2017 USD ($) $ / shares shares		Jun. 30, 2016 USD ($) $ / shares shares		Jul. 01, 2018 USD ($)	Jun. 30, 2015 USD ($)
Summary of Significant Accounting Policies [Line Items]
Provision for income taxes										$ 550,300,000	$ 797,700,000		$ 741,300,000
Operating Leases, Rent Expense										$ 234,900,000	$ 234,500,000		201,700,000
Number of Businesses Acquired											2
Percent of Level Two Investment Pricing Inputs Provided by Independent Pricing Service		99.00%								99.00%
Goodwill		$ 2,243,500,000				$ 1,741,000,000				$ 2,243,500,000	$ 1,741,000,000		1,682,000,000
Net earnings from continuing operations										$ 1,620,800,000	$ 1,733,400,000		$ 1,493,400,000
Basic weighted average shares outstanding (in shares) | shares										440.6	447.8		457.0
Effect of Employee Stock Option Shares | shares										1.1	0.9		0.8
Effect of Employee Restricted Stock Shares | shares										1.6	1.6		1.3
Diluted weighted average shares outstanding (in shares) | shares										443.3	450.3		459.1
EPS from continuing operations, Basic (in dollars per share) | $ / shares		$ 0.25	$ 1.46	$ 1.06	$ 0.91	$ 0.60	$ 1.32	$ 1.14	$ 0.82	$ 3.68	$ 3.87		$ 3.27
EPS from continuing operations, Diluted (in dollars per share) | $ / shares		$ 0.25	$ 1.45	$ 1.05	$ 0.90	$ 0.59	$ 1.31	$ 1.13	$ 0.81	$ 3.66	$ 3.85		$ 3.25
Options excluded from the calculation of diluted earnings per share because their exercise prices exceeded the average market price (in shares) | shares										0.9	1.0		1.8
Unrecognized Tax Benefits		$ 45,200,000				$ 74,600,000				$ 45,200,000	$ 74,600,000		$ 27,400,000			$ 27,100,000
Threshold of coverage for all losses per occurrence covered by reinsurance arrangement, next fiscal year										1,000,000
Payments for Reinsurance										218,000,000
Tax Cuts and Jobs Act of 2017, Reclassfication from AOCI to Retained Earnings, Tax Effect	[1]									42,300,000
Tax Settlements Future Impact Potential On Earnings Maximum										2,000,000
Debt Instrument, Face Amount		2,000,000,000								2,000,000,000
Net Cash Provided by (Used in) Operating Activities										2,515,200,000	2,125,900,000	[2]	$ 1,897,300,000	[2]
Max Expected Cash Payment On Tax Settlements										25,000,000
Impact of Adoption of ASC606		$ 37,088,700,000				$ 37,180,000,000				$ 37,088,700,000	37,180,000,000
Minimum [Member]
Summary of Significant Accounting Policies [Line Items]
Internal Use Software Life of Asset										3 years
Minimum [Member] | Data Processing Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant, and Equipment Useful Life										2 years
Minimum [Member] | Building [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant, and Equipment Useful Life										20 years
Minimum [Member] | Furniture and Fixtures [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant, and Equipment Useful Life										4 years
Maximum [Member]
Summary of Significant Accounting Policies [Line Items]
Internal Use Software Life of Asset										5 years
Maximum [Member] | Data Processing Equipment [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant, and Equipment Useful Life										5 years
Maximum [Member] | Building [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant, and Equipment Useful Life										40 years
Maximum [Member] | Furniture and Fixtures [Member]
Summary of Significant Accounting Policies [Line Items]
Property, Plant, and Equipment Useful Life										7 years
Notes due on 2020 [Member]
Summary of Significant Accounting Policies [Line Items]
Debt Instrument, Term										5 years
Notes due on 2025 [Member]
Summary of Significant Accounting Policies [Line Items]
Debt Instrument, Term										10 years
Restatement Adjustment [Member]
Summary of Significant Accounting Policies [Line Items]
Provision for income taxes										$ 384,700,000	829,100,000
Net earnings from continuing operations										$ 1,897,900,000	$ 1,787,800,000
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]
Summary of Significant Accounting Policies [Line Items]
Impact of Adoption of ASC606															$ 1,700,000,000

[1] During fiscal 2018, the Company adopted ASU 2018-02 and reclassified stranded tax effects attributable to the Act from AOCI to retained earnings. The fiscal 2018 Consolidated Balance Sheets reflect the reclassification out of accumulated other comprehensive (loss)/income into retained earnings (see Note 1).

[2] See Note 1 for a summary of adjustments.