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Goodwill and Other Intangibles (Other Intangible Assets) (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]    
Gross Carrying Amount $ 213.7 $ 222.7
Less: Accumulated Amortization 64.6 61.3
Net Book Value $ 149.1 $ 161.4