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Operating Leases - Summary of Operating Leases Cash Flows (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Leases [Abstract]    
Operating lease liabilities $ (4.5) $ 0.0
Reduction of right-of-use assets resulting from reductions to lease obligations 1.2  
Asset obtained in exchange for operating lease liability $ 3.1  
Operating lease, weighted average remaining lease term (years) 10 years 6 months  
Operating lease, weighted average discount rate (percent) 5.00%