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Lease Commitments - Total Lease Costs (Net) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Leases [Abstract]  
Operating lease costs $ 41.7
Short-term lease costs 2.1
Variable lease costs 0.1
Sublease income (4.4)
Total lease costs (net) $ 39.5