2013

2012

2011

(In millions of dollars)

Increase in trade accounts receivable

$

(14.6

)

$

(57.9

)

$

(148.5

)

Increase in prepaid expenses and other assets

(11.8

)

(12.5

)

(4.7

)

Increase in accounts payable and accrued liabilities

43.8

54.1

58.9

Increase in accrued payroll and related taxes

39.2

2.4

34.3

(Decrease) increase in accrued insurance

(2.9

)

(8.7

)

0.2

Increase (decrease) in income and other taxes

5.5

(3.7

)

4.8

Total changes in operating assets and liabilities

$

59.2

$

(26.3

)

$

(55.0

)