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Operating Leases - Schedule of Operating Lease Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]      
Amortization of right-of-use operating lease assets $ 13.4 $ 0.0 $ 0.0
Interest on operating lease liability 4.6    
Operating lease charge $ 18.0 $ 0.0 $ 0.0