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Health Advances (Detail) - USD ($)
$ in Millions
Jan. 19, 2016
Jul. 01, 2014
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition, Contingent Consideration, at Fair Value     $ 18.0   $ 5.2  
Goodwill     476.3   $ 389.2 $ 354.9
Health Advances Acquisition [Member]            
Payments to Acquire Businesses, Gross $ 67.3          
Business Combination, Receivable from Working Capital Adjustment (0.2)     $ 0.2    
Business Acquisition, Cost of Acquired Entity, Purchase Price 71.6          
Business Acquisition, Contingent Consideration, Potential Cash Payment 15.8          
Business Acquisition, Contingent Consideration, at Fair Value 4.5          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 4.0          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets 0.7          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 1.0          
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets 0.2          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 15.0          
Goodwill 52.5          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 73.4          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities 1.8          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities 1.8          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 71.6          
Atlas [Member]            
Payments to Acquire Businesses, Gross   $ 2.1        
Goodwill     $ 1.4      
Customer Relationships [Member] | Health Advances Acquisition [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 11.6          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 10 years          
Technology-Based Intangible Assets [Member] | Health Advances Acquisition [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 1.8          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 3 years          
Trade Names [Member] | Health Advances Acquisition [Member]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles $ 1.6          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life 5 years