Leases - ROU Assets and Lease Liability Balances (Details) $ in Millions	Mar. 31, 2020 USD ($)
Assets
Operating ROU assets	$ 71.1
Finance ROU assets	27.3
Total ROU assets	98.4
Current
Operating	12.8
Finance	0.5
Non-current
Operating	63.1
Finance	27.4
Total lease liabilities	103.8
Finance lease assets accumulated amortization	$ 1.0
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:DebtCurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongTermDebtNoncurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent