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Leases - Narrative (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Lessee, Lease, Description [Line Items]  
Lease liability $ 98.2
Other assets, net 75.3
Office Lease  
Lessee, Lease, Description [Line Items]  
Lease liability 64.1
Other assets, net 42.8
Compression and Other Field Equipment  
Lessee, Lease, Description [Line Items]  
Lease liability 19.2
Other assets, net 23.0
Office Equipment  
Lessee, Lease, Description [Line Items]  
Lease liability 0.8
Other assets, net 0.8
Land  
Lessee, Lease, Description [Line Items]  
Lease liability 14.9
Other assets, net $ 13.2