Fair Value Measurements Fair Value Disclosure Narrative (Details) - USD ($) $ in Millions			12 Months Ended
	Jan. 19, 2016	Oct. 03, 2014	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments for contingent consideration				$ (9.9)	$ 0.0
Business Combination, Expected Contingent Consideration Payment			(18.0)
Payments to Acquire Businesses, Net of Cash Acquired			184.6	67.3	104.5
Change in fair value of contingent consideration			1.3	8.7
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Asset			2.9	(8.7)	$ 7.4
Long-term Debt, Fair Value			$ 97.3
Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities Maturity Period			1 year
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities Maturity Period			90 days
ClinIntel Acquisition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payments for contingent consideration				(14.1)
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High		$ 16.2
Business Combination, Contingent Consideration Payment Period		21 months
Payments to Acquire Businesses, Net of Cash Acquired		$ 8.8
Health Advances Acquisition [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 15.8
Payments to Acquire Businesses, Net of Cash Acquired	67.1
Payments to Acquire Businesses, Gross	$ 67.3
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net			$ 1.1	$ 1.3
Accelerated Share Repurchases, Date [Domain] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net			$ 20.7