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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, 2016
Dec. 31, 2015
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]    
Balance beginning of period $ 8.7 $ 16.2
Additions 95.6 0.5
Collections (37.0) (8.0)
Balance end of period $ 67.3 $ 8.7