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Other Financial Statement Data (Tables)
 12 Months Ended
Dec. 31, 2018
Balance Sheet Related Disclosures [Abstract]  
Schedule of Other Assets and Other Liabilities
The following provides additional information concerning selected balance sheet accounts:
 
December 31,
(in millions)
2018
 
2017
Receivables
 
 
 
Trade
$
703.7

 
$
563.6

Non-trade
136.1

 
81.3

 
839.8

 
644.9

Less allowance for doubtful accounts
1.3

 
2.3

 
$
838.5

 
$
642.6

Inventories
 
 
 
Raw materials
$
147.5

 
$
37.8

Work in process
625.5

 
349.9

Finished goods
1,343.8

 
1,035.1

Final price deferred (a)
39.3

 
38.6

Operating materials and supplies
114.1

 
85.8

 
$
2,270.2

 
$
1,547.2

Other current assets
 
 
 
Income and other taxes receivable
$
149.2

 
$
141.3

Prepaid expenses
86.8

 
69.0

Other
44.6

 
62.9

 
$
280.6

 
$
273.2

Other assets
 
 
 
Restricted cash
$
15.8

 
$
32.6

MRO inventory
134.6

 
114.8

Marketable securities held in trust - restricted
632.3

 
628.0

Indemnification asset
30.7

 
—

Long-term receivable
91.7

 
—

Other
352.7

 
492.1

 
$
1,257.8

 
$
1,267.5

 
December 31,
(in millions)
2018
 
2017
Accrued liabilities
 
 
 
Accrued dividends
$
11.8

 
$
12.1

Payroll and employee benefits
217.5

 
159.5

Asset retirement obligations
136.3

 
98.1

Customer prepayments
199.8

 
140.4

Accrued income tax
65.5

 
1.4

Other
461.6

 
342.9

 
$
1,092.5

 
$
754.4

Other noncurrent liabilities
 
 
 
Asset retirement obligations
$
1,023.8

 
$
761.2

Accrued pension and postretirement benefits
146.3

 
53.7

Unrecognized tax benefits
33.0

 
33.5

Other
255.6

 
119.4

 
$
1,458.7

 
$
967.8


______________________________
Schedule of Other Nonoperating Income (Expense)
Interest expense, net was comprised of the following in 2018, 2017 and 2016:
 
Years Ended December 31,
(in millions)
2018
 
2017
 
2016
Interest income
$
49.7

 
$
33.2

 
$
28.2

Less interest expense
215.8

 
171.3

 
140.6

Interest expense, net
$
(166.1
)
 
$
(138.1
)
 
$
(112.4
)