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Commitments and Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 13, 2019
Jan. 16, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments for demand charges under existing long-term contracts and binding precedent agreements with various pipelines          
Operating leases, rent expense     $ 117.4 $ 60.8 $ 44.1
Future lease payments under non-cancelable operating leases     109.9    
Future lease payments under non-cancelable operating leases, 2019     70.3    
Future lease payments under non-cancelable operating leases, 2020     8.4    
Future lease payments under non-cancelable operating leases, 2021     8.4    
Future lease payments under non-cancelable operating leases, 2022     8.4    
Future lease payments under non-cancelable operating leases, 2023     8.4    
Future lease payments under non-cancelable operating leases, thereafter     6.0    
Damages sought   100      
Remedial action included in other credits     11.8    
Pipeline Demand Charges          
Commitments for demand charges under existing long-term contracts and binding precedent agreements with various pipelines          
Amount due as of the balance sheet date     23,500.0    
Amount due in 2019     1,300.0    
Amount due in 2020     1,700.0    
Amount due in 2021     1,800.0    
Amount due in 2022     1,800.0    
Amount due in 2023     1,700.0    
Amount due thereafter     15,200.0    
Frac Sand and Equipment          
Commitments for demand charges under existing long-term contracts and binding precedent agreements with various pipelines          
Amount due as of the balance sheet date     $ 74.0    
Subsequent Event          
Commitments for demand charges under existing long-term contracts and binding precedent agreements with various pipelines          
Payments for legal settlements $ 53.5