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Contingencies - Schedule of Notes Receivable Balances from Insurance Companies (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]    
Balance beginning of period $ 59.6 $ 76.9
Additions 1.1 1.7
Collections (5.1) (19.0)
Balance end of period $ 55.6 $ 59.6