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Commitments and Contingencies - Leases Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Mar. 03, 2017
Dec. 30, 2016
Commitments and Contingencies Disclosure [Abstract]            
Facility purchase price           $ 720.0
Payment towards purchase price of Tarrytown facility     $ 57.0      
Aggregate funding advanced by the participants         $ 720.0  
Reimbursement received by the Company         $ 57.0  
Initial term of lease 5 years          
Potential extended term of lease 5 years          
Loss on extinguishment of debt     30.1      
Tarrytown facility capital and facility lease obligations     720.0      
Interest expense in connection with capital and facility leases   $ 21.5 $ 19.5 $ 5.4