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Operating Leases - Schedule of Operating Lease Costs (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Leases [Abstract]    
Amortization of right-of-use operating lease assets $ 3.3 $ 0.0
Interest on operating lease liabilities 1.2  
Operating lease charge $ 4.5 $ 0.0