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Segment and Related Information (Tables)

12 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Schedule of Segment Performance Based on Income (Loss) before Interest Income and Other Income and Expense

The Company evaluates segment performance based on income (loss) before interest income and other income and expense.

		Diagnostics				Other				Total
Year ended June 30, 2018:
Revenues		$	719.3			$	53.3			$	772.6
Depreciation and amortization			49.2				5.2				54.4
Segment operating income (loss)			139.4				(20.7	)			118.7
Year ended June 30, 2017:
Revenues		$	720.6			$	49.3			$	769.9
Depreciation and amortization			42.8				5.5				48.3
Segment operating income (loss)			129.4				(80.7	)			48.7
Year ended June 30, 2016:
Revenues		$	692.4			$	48.1			$	740.5
Depreciation and amortization			21.6				5.2				26.8
Segment operating income (loss)			225.9				(72.5	)			153.4

		Years Ended June 30,
		2018				2017				2016
Total operating income for reportable segments		$	118.7			$	48.7			$	153.4
Unallocated amounts:
Interest income			1.8				1.2				0.9
Interest Expense			(3.2	)			(6.0	)			(0.3	)
Other			(0.4	)			(3.0	)			2.0
Income from operations before income taxes			116.9				40.9				156.0
Income tax provision			(14.0	)			20.6				38.8
Net income			130.9				20.3				117.2
Net loss attributable to non-controlling interest			(0.2	)			(0.2	)			—
Net income attributable to Myriad Genetics, Inc. stockholders		$	131.1			$	20.5			$	117.2

Schedule Of Comparison of Balance Sheet Assets by Operating Segment

The following table sets forth a comparison of balance sheet assets by operating segment:

		June 30,
		2018				2017
Net equipment, leasehold improvements and property:
Diagnostics			12.2				20.2
Other			31.0				30.9
Total		$	43.2			$	51.1
Total Assets:
Diagnostics			840.3				885.4
Other			122.5				124.3
Total		$	962.8			$	1,009.7

Summary of Assets by Geographical Region

The following table reconciles assets by geographical region:

		June 30,
		2018				2017
Net equipment, leasehold improvements and property:
United States			20.0				27.6
Rest of world			23.2				23.5
Total		$	43.2			$	51.1
Total Assets:
United States			852.3				897.3
Rest of world			110.5				112.4
Total		$	962.8			$	1,009.7

Reconciliation of Assets by Operating Segment and Geographic Region to Total Assets

The following table reconciles assets by operating segment and geographic region to total assets:

		June 30,
		2018				2017
Total assets by segment and geographical region		$	962.8			$	1,009.7
Cash, cash equivalents, and marketable investment    securities (1)			211.3				199.2
Total		$	1,174.1			$	1,208.9

(1) The Company manages cash, cash equivalents, and marketable investment securities at the consolidated level for all segments

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