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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Intangible Assets) (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]      
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships $ 79.8 $ 71.5  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 8.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 7.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 6.6    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 6.4    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 6.2    
Other Intangible Assets [Member]      
Acquired Finite-Lived Intangible Assets [Line Items]      
Finite-Lived Intangible Asset, Useful Life 10 years    
Finite-lived Intangible Assets Acquired $ 37.4 3.1  
Accumulated Amortization Of Values Of Business Acquired Distribution Agreements And Customer Relationships 4.4 0.6  
Amortization of Intangible Assets 3.8 $ 0.3 $ 0.2
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 4.2    
Finite-Lived Intangible Assets, Amortization Expense, Year Two 4.2    
Finite-Lived Intangible Assets, Amortization Expense, Year Three 4.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Four 4.1    
Finite-Lived Intangible Assets, Amortization Expense, Year Five $ 4.1