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Goodwill And Other Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
 5 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2015
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]            
Amortization expense of intangible assets $ 5.5 $ 6.6 $ 6.9 $ 13.6 $ 14.3  
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months           $ 6.3
Finite-Lived Intangible Assets, Amortization Expense, Year Two       12.2   12.2
Finite-Lived Intangible Assets, Amortization Expense, Year Three       11.4   11.4
Finite-Lived Intangible Assets, Amortization Expense, Year Four       10.7   10.7
Finite-Lived Intangible Assets, Amortization Expense, Year Five       $ 10.1   $ 10.1