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Contingencies - Summary of Notes Receivable from Insurance Companies and Activity During the Year (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]    
Balance beginning of period $ 76.9 $ 67.3
Additions 1.7 35.1
Collections (19.0) (25.5)
Balance end of period $ 59.6 $ 76.9