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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, 2017	Dec. 31, 2016
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance beginning of period	$ 67.3	$ 8.7
Additions	35.1	95.6
Collections	(25.5)	(37.0)
Balance end of period	$ 76.9	$ 67.3