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Stock-Based Payments (Tables)
12 Months Ended
Dec. 31, 2016
Share-based Compensation [Abstract]  
Compensation expense for stock-based payments and total income tax benefit recognized
Total compensation expense for stock-based payments and total income tax benefit recognized in the consolidated statements of income for stock-based awards were as follows:
(in millions)
 
2016
 
2015
 
2014
Compensation expense
 
$
66.4

 
$
61.0

 
$
55.0

Income tax benefit recognized
 
38.6

 
32.4

 
19.5

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The following table summarizes stock option activity for 2016. Aggregate intrinsic value is in millions.
 
 
Number of Shares
 
Weighted
Average
Exercise
Price
 
Weighted Average Remaining Contractual Life (in years)
 
Aggregate Intrinsic Value
Outstanding at December 31, 2015
 
1,814,051

 
$
73

 
3.3
 
$
38.7

Exercised
 
(692,784
)
 
76

 
 
 
 
Cancelled
 
(99,730
)
 
101

 
 
 
 
Outstanding at December 31, 2016
 
1,021,537

 
69

 
2.9
 
47.4

Exercisable at December 31, 2016
 
1,021,537

 
69

 
2.9
 
47.4

Schedule of Nonvested Share Activity [Table Text Block]
The following table summarizes restricted stock, restricted stock units, and performance shares activity for 2016:
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
Outstanding at December 31, 2015
1,922,298

 
$
83

Granted
811,436

 
105

Vested
(569,892
)
 
72

Cancelled
(343,264
)
 
73

Outstanding at December 31, 2016
1,820,578

 
98