Other Consolidated Balance Sheet Accounts Detail (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowances for Credit Losses, Accounts Receivable
Balance, beginning of year	$ 14.5	$ 8.3	$ 7.3
Net additions charged to operations	7.6	7.1	3.6
Less: Write-offs and adjustments	(5.6)	(0.9)	(2.6)
Balance, end of year	16.5	14.5	$ 8.3
Other Receivables, Net
Vendor receivables, net	82.0	73.1
Insurance recoverables, current	4.1	3.1
Other miscellaneous receivables	19.4	20.0
Total other receivables, net	105.5	96.2
Deposits and Prepayments
Vendor prepayments	59.6	85.8
Prepaid taxes	2.0	0.5
Deposits	7.1	7.0
Racking allowances, current	5.6	6.8
Other prepayments	13.5	15.9
Total deposits and prepayments	87.8	116.0
Other Non-current Assets, Net
Insurance recoverables	15.4	14.4
Racking allowances, net	1.6	3.5
Insurance deposits	2.9	3.4
Debt issuance costs	0.1	1.0
Other assets	4.4	6.3
Total other non-current assets, net	24.4	28.6
Accrued Liabilities
Accrued payroll and other benefits	52.3	47.7
Accrued customer incentives payable	43.4	37.3
Claims liabilities, current	22.5	20.4
Finance lease liabilities	15.3	8.4
Income taxes payable	14.1	2.7
Indirect taxes	10.2	9.3
Vendor advances	3.1	3.1
Other accrued expenses	27.1	22.1
Total accrued liabilities	$ 188.0	$ 151.0