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Reporting and Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Advertising Costs
Total advertising costs, which are expensed as incurred, for the years ended
December 31, were:
(millions)
Advertising Costs

2017
$
1,005.4

2016
756.2

2015
748.3
Property and Equipment
The useful lives for property and equipment at December 31, 2017, were:
 
Useful Lives
Computer equipment and laptops
3 years
Software licenses (internal use)
1-5 years
Capitalized software
3-10 years
Buildings, improvements, and integrated components
7-40 years
All other property and equipment
3-15 years
Interest Capitalized
Total capitalized interest, which primarily relates to capitalized software projects, for the years ended December 31, was:
(millions)
Capitalized
Interest

2017
$
2.8

2016
2.9

2015
2.4
Equity Based Compensation and Related Tax Benefits
The total compensation expense recognized for equity-based compensation, both our equity and liability awards, for the years ended December 31, was:
(millions)
2017

2016

2015

Pretax expense
$
95.4

$
85.2

$
66.2

Tax benefit1
33.4

29.8

23.2


1Reflected at the 35% corporate federal tax rate; the revaluation to the 21% rate is reflected in the total revaluation adjustment recorded at December 31, 2017 (see Note 5 – Income Taxes for further discussion).
Supplemental Cash Flow Information
For the years ended December 31, we paid the following:
(millions)
2017

2016

2015

Income taxes
$
715.6

$
459.4

$
701.8

Interest
146.3

139.2

132.0