Other Financial Statement Data (Details) - USD ($) $ in Millions		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Other current assets
Income and other taxes receivable		$ 319.5	$ 179.5
Prepaid expenses		125.7	110.7
Other		52.8	28.6
Total other current assets		498.0	318.8
Other assets
Restricted cash		4.1	5.4	$ 9.0
MRO inventory		133.5	126.8
Marketable securities held in trust		709.0	691.7
Operating Lease, Right-of-Use Asset		179.1	192.1
Indemnification asset		24.1	40.6
Nontrade Receivables, Noncurrent		56.6	81.6
Other		232.8	316.2
Total other assets		1,339.2	1,454.4
Accrued liabilities
Dividends Payable		0.6	20.0
Payroll and employee benefits		127.1	173.8
Asset retirement obligations		147.5	154.4
Customer Funds	[1]	295.4	266.9
Contractual Obligation For Equity Method Investment		2.3	33.9
Operating Lease, Liability, Current		64.2	67.1
Other		383.3	365.8
Accrued liabilities		1,020.4	1,081.9
Other noncurrent liabilities
Asset retirement obligations		1,113.2	1,160.8
Operating Lease, Liability, Noncurrent		116.5	127.0
Accrued pension and postretirement benefits		143.3	173.6
Unrecognized tax benefits		39.9	42.1
Other		231.5	269.5
Total other noncurrent liabilities		$ 1,644.4	$ 1,773.0

[1] The timing of recognition of revenue related to our performance obligations may be different than the timing of collection of cash related to those performance obligations.  Specifically, we collect prepayments from certain customers in Brazil. In addition, cash collection from Canpotex may occur prior to delivery of product to the end customer.  We generally satisfy our contractual liabilities within one quarter of incurring the liability.