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Goodwill and Intangible Assets - Carrying Amount of Goodwill (Details) - USD ($)
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Goodwill [Roll Forward]      
Beginning balance $ 327,600,000 $ 417,200,000 $ 318,600,000
Acquisitions   0 94,900,000
Adjustments to acquisitions   0 4,400,000
Goodwill deconsolidated on sale of Clinic   (7,300,000) 0
Goodwill impairment charge 0 (82,000,000.0) 0
Translation adjustments 1,600,000 (300,000) (700,000)
Ending balance 329,200,000 327,600,000 417,200,000
Diagnostic      
Goodwill [Roll Forward]      
Beginning balance 270,700,000 351,600,000 252,800,000
Acquisitions   0 94,900,000
Adjustments to acquisitions   0 4,400,000
Goodwill deconsolidated on sale of Clinic   0 0
Goodwill impairment charge   (80,700,000) 0
Translation adjustments 1,600,000 (200,000) (500,000)
Ending balance 272,300,000 270,700,000 351,600,000
Other      
Goodwill [Roll Forward]      
Beginning balance 56,900,000 65,600,000 65,800,000
Acquisitions   0 0
Adjustments to acquisitions   0 0
Goodwill deconsolidated on sale of Clinic   (7,300,000) 0
Goodwill impairment charge   (1,300,000) 0
Translation adjustments 0 (100,000) (200,000)
Ending balance $ 56,900,000 $ 56,900,000 $ 65,600,000