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Income Taxes - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018	Jul. 31, 2018
Income Tax Contingency [Line Items]
Tax benefit related to operating loss carryback, CARES Act	$ 20.7
Final tax benefit of Tax Act				$ 32.0
Earnings per share impact of Tax Act				$ 0.44
Increase in valuation allowance	(0.3)	$ 3.5	$ 1.1	$ 0.6
Net deferred tax liabilities	174.3	166.1	185.6
Deferred tax assets	145.0	181.9	141.9
Net unrecognized tax benefits	$ 30.5	$ 23.5	$ 21.7
U.S. Federal and state jurisdictions | Earliest tax year
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2015
U.S. Federal and state jurisdictions | Latest tax years
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2020
Foreign | Earliest tax year
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2013
Foreign | Latest tax years
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2020
Foreign | Germany | Earliest tax year
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2013
Foreign | Germany | Latest tax years
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2015
Foreign | Switzerland | Earliest tax year
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2015
Foreign | Switzerland | Latest tax years
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2016
State and local jurisdictions | New Jersey | Earliest tax year
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2013
State and local jurisdictions | New Jersey | Latest tax years
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2017
State and local jurisdictions | New York | Earliest tax year
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2016
State and local jurisdictions | New York | Latest tax years
Income Tax Contingency [Line Items]
Tax year being audited in income tax examination	2018
Counsyl Inc
Income Tax Contingency [Line Items]
Net deferred tax liabilities					$ 67.6
Deferred tax assets					$ 60.7

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