Credit Losses (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2020
Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 1.7		$ 6.8
Current period provision	0.4		1.2
Balance at end of period	1.5		1.7
Trade Accounts Receivable
Allowance for Credit Losses [Roll Forward]
Write-offs - trade accounts receivable	$ (0.6)		(0.7)
Notes and Other Receivables
Allowance for Credit Losses [Roll Forward]
Write-offs - trade accounts receivable		$ (5.6)	$ (5.6)