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Contingencies - Schedule of Notes Receivable Balances from Insurance Companies (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]    
Balance beginning of period $ 67.3 $ 8.7
Additions 34.2 95.6
Collections (23.5) (37.0)
Balance end of period $ 78.0 $ 67.3