Leases - ROU Assets and Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020
Operating lease assets:
Other assets	$ 34.3	$ 52.0
Operating lease liabilities:
Other accrued liabilities	9.0	11.5
Other liabilities	35.5	50.3
Total operating lease liabilities	$ 44.5	$ 61.8
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued liabilities	Accrued liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherAccruedLiabilitiesNoncurrent	us-gaap:OtherAccruedLiabilitiesNoncurrent