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Leases (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]    
Lease expense, noncancelable operating leases   $ 72.1
Minimum    
Lessee, Lease, Description [Line Items]    
Lessor, operating lease, renewal term 6 months  
Maximum    
Lessee, Lease, Description [Line Items]    
Lessor, operating lease, renewal term 10 years