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Subsequent Event (Notes)	3 Months Ended
Subsequent Event (Notes)	Jun. 30, 2020
Subsequent Event [Line Items]
Subsequent Events	SUBSEQUENT EVENTS In July 2020, the Company acquired two businesses and related assets for approximately $200.0 in cash (net of cash acquired). These acquisitions will be included in both the LCD and CDD segments and were made primarily to extend the Company's geographic reach in important market areas, enhance the Company's scientific differentiation and to expand the breadth and scope of the Company's services. On July 17, 2020, notice was given to holders of $412.2 of the Company’s senior notes, due November 15, 2020, that the Company had elected to redeem the outstanding securities on August 17, 2020 at par. The Company will repay the notes with available cash on hand and borrowings under its revolving credit facility.