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Lease Cost (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Lease, Cost [Abstract]    
Operating lease cost $ 3.1 $ 3.2
Short-term lease cost 0.2 0.2
Variable lease cost 0.8 0.6
Total lease cost $ 4.1 $ 4.0