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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, 2020	Dec. 31, 2019
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance beginning of period	$ 56.0	$ 59.6
Additions	1.4	1.5
Collections	(5.1)	(5.1)
Balance end of period	$ 52.3	$ 56.0