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Asset Impairments (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Aggregate pre-tax non-cash asset impairment charges $ 19.3 $ 38.7   $ 30.0
Pre-tax impairment charges on long-term assets   $ 5.1 $ 0.2  
Pre-tax non-cash asset impairment charges       $ 2.8