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Commitments And Contingencies (Leases) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]        
Operating Leases, 2019   $ 23.4    
Operating Leases, 2020   19.6    
Operating Leases, 2021   17.0    
Operating Leases, 2022   14.2    
Operating Leases, 2023   12.4    
Operating Leases, Thereafter   60.7    
Operating Leases, Future Minimum Payments Due, Total   147.3    
Rental expense   $ 33.8 $ 26.6 $ 25.4
Airplane Operating Lease Period Years 7      
Residual value guarantee liability $ 11.1      
Fair Value Of Residual Value Guarantee, Fair Value of Operating Lease Asset Threshold 14.4      
Payments for airplane $ 6.7