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Commitments, Contingencies and Other (Details)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 19, 2017
claim
Sep. 20, 2017
claim
Sep. 09, 2017
claim
Dec. 19, 2017
claim
Sep. 30, 2018
USD ($)
facility
bed
Commitments and Contingencies [Line Items]          
Estimate of possible loss         $ 19.6
Estimated construction capital project cost         229.4
Cost already spent on existing capital projects         188.7
Remaining capital required for capital projects         $ 40.7
Number of vacant beds at idle facilities marketed to potential customers | bed         4,700
Number of marketed idle facilities | facility         4
Property and Equipment          
Commitments and Contingencies [Line Items]          
Carrying values of idle facilities marketed to potential customers         $ 124.1
Pending Litigation | Immigration Detainees Against Company          
Commitments and Contingencies [Line Items]          
New claims filed, number | claim       3  
WASHINGTON | Pending Litigation | Immigration Detainees Against Company          
Commitments and Contingencies [Line Items]          
New claims filed, number | claim   2 1    
CALIFORNIA | Pending Litigation | Immigration Detainees Against Company          
Commitments and Contingencies [Line Items]          
New claims filed, number | claim 1