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Discontinued Operations (Tables)
3 Months Ended
Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]  
Summary of revenue, operating profit, income tax expense and after-tax effects of these transactions
The revenue, operating profit, income tax expense and after-tax effects of sales treated as discontinued operations were as follows (in millions): 
 
Quarter Ended
 
March 31,
 
2015
 
2014
Proceeds from the sale of income-producing properties
$

 
$
70.1

Real estate leasing revenue

 
0.3

 
$

 
$
70.4

 
 
 
 
Gain on sale of income-producing properties
$

 
$
55.9

Real estate leasing operating profit

 
0.3

Total operating profit before taxes

 
56.2

Income tax expense

 
21.9

Income from discontinued operations
$

 
$
34.3