Other Consolidated Balance Sheet Accounts Detail (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of year	$ 10.9	$ 10.8	$ 9.4
Net additions charged to operations	2.0	1.3	2.2
Less: Write-offs and adjustments	(5.8)	(1.2)	(0.8)
Balance, end of year	7.1	10.9	$ 10.8
Other Receivables, Net, Current [Abstract]
Vendor receivables, net	90.6	59.0
Insurance recoverables, current	2.1	1.5
Other	13.8	8.9
Total other receivables, net	106.5	69.4
Deposits and Prepayments [Abstract]
Vendor prepayments	44.7	34.1
Deposits	8.5	4.7
Prepaid taxes	10.5	10.6
Racking allowances, current	5.7	6.4
Other prepayments	13.4	9.2
Total deposits and prepayments	82.8	65.0
Other Assets, Noncurrent [Abstract]
Insurance recoverables	12.9	14.4
Debt issuance costs	1.6	0.9
Insurance deposits	3.4	2.9
Racking allowances, net	5.0	6.5
Other assets	3.7	3.4
Total other non-current assets, net	26.6	28.1
Accrued Liabilities, Current [Abstract]
Accrued payroll, retirement and other benefits	35.7	29.9
Claims liabilities, current	13.4	11.9
Accrued customer incentives payable	40.1	20.3
Indirect taxes	6.2	7.3
Vendor advances	10.9	11.0
Other accrued expenses	25.5	26.5
Total accrued liabilities	$ 131.8	$ 106.9