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Accounting Developments (Tables)
 6 Months Ended
Jun. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Accounting Updates Adopted in 2019
Summary of Financial Statement Impacts of Accounting Updates Adopted in 2019:
 
Balance at December 31, 2018
 
Balance at January 1, 2019
 
Effect of Change
 
(in millions of dollars)
Adjustments due to ASC 842
 
 
 
 
 
Consolidated Balance Sheets
 
 
 
 
 
Assets
 
 
 
 
 
Other Assets
$
789.0

 
$
906.7

 
$
117.7

Deferred Income Tax
109.9

 
109.5

 
(0.4
)
 
 
 
 
 
 
Liabilities
 
 
 
 
 
Other Liabilities
1,762.8

 
1,884.8

 
122.0

Income Tax Payable
24.0

 
22.7

 
(1.3
)
 
 
 
 
 
 
Stockholders' Equity
 
 
 
 
 
Retained Earnings
9,863.1

 
9,859.7

 
(3.4
)