Contingencies - Schedule of Notes Receivable Balances from Insurance Companies (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance beginning of period	$ 8.7	$ 16.2
Additions	94.9	0.5
Collections	0.0	(8.0)
Balance end of period	$ 103.6	$ 8.7