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Goodwill and Other Intangible Assets (Indefinite-Lived Intangible Assets) (Details) - Trademarks and Tradenames [Member]
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
Indefinite-lived intangible assets:  
Balance at beginning of period $ 88.6
Foreign currency translation 1.0
Balance at end of period $ 89.6