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Leases (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
property
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2019
USD ($)
Other Commitments [Line Items]        
Operating lease right of use assets $ 94.6 $ 0.0   $ 93.9
Operating Lease, Liability $ 101.5     $ 99.4
Number of Leased Properties Owned by Related Parties | property 2      
Costs and Expenses, Related Party $ 1.2 1.3    
Lessee, Operating Lease, Lease Not yet Commenced, Term of Contract 5 years 3 months 18 days      
Operating Leases, Rent Expense   $ 32.7 $ 26.4  
Operating Real Estate Leases        
Other Commitments [Line Items]        
Lessee, Operating Leases, Leases Not Yet Commenced Value $ 2.0