Contingencies - Schedule of Notes Receivable Balances from Insurance Companies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance beginning of period	$ 52.3	$ 56.0
Additions	0.4	1.4
Collections	0.0	(5.1)
Balance end of period	$ 52.7	$ 52.3