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Commitments And Contingencies (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
plaintiffs
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Rental expenses $ 32.6 $ 50.9 $ 54.4
2017 32.7    
2018 24.2    
2019 18.0    
2020 10.6    
2021 9.5    
Thereafter 37.4    
Loss Contingency, Damages Sought, Value $ 45.0    
Loss Contingency, Number of Plaintiffs | plaintiffs 32    
Loss Contingency, Claims Settled, Number | plaintiffs 58    
Letters of Credit Outstanding, Amount $ 55.5