Leases - Schedule of Right-of-Use Assets and Lease Liabilities (Details) $ in Millions	Jun. 30, 2019 USD ($)
Lessee, Lease, Description [Line Items]
ROU lease asset	$ 23.8
Lease liability	$ 24.1
Operating lease, weighted average incremental borrowing rate, percent	4.60%
HG/BAM
Lessee, Lease, Description [Line Items]
ROU lease asset	$ 11.3
Lease liability	11.3
NSM Holding Co LLC
Lessee, Lease, Description [Line Items]
ROU lease asset	5.0
Lease liability	5.0
Kudu
Lessee, Lease, Description [Line Items]
ROU lease asset	2.4
Lease liability	2.4
Other Operations
Lessee, Lease, Description [Line Items]
ROU lease asset	5.1
Lease liability	$ 5.4