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Incentive Compensation Plans Stock-based Compensation, Grants in Period Weighted Average (Tables)
 12 Months Ended
Dec. 31, 2017
Summary of Stock Options Assumptions [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block]
Stock-based compensation awards expected to be settled in cash have been classified as liabilities in our Consolidated Balance Sheets as of December 31, 2017 and 2016.
 
 
Years ended December 31,
 
 
2017
 
2016
 
2015
Stock-Settled Awards:
 
 
 
 
 
 
Awards granted
 
0.8

 
1.1

 
0.8

Weighted-average grant-date fair value (per award)
 
$
24.18

 
$
21.87

 
$
22.07

Total fair value of vested awards distributed
 
$
22.6

 
$
17.5

 
$
18.8

Cash-Settled Awards:
 
 
 
 
 
 
Awards granted
 
0.0

 
0.1

 
0.1

Weighted-average grant-date fair value (per award)
 
$
23.33

 
$
22.54

 
$
20.46

Total fair value of vested awards distributed
 
$
0.9

 
$
0.7

 
$
0.2

Performance-Based Awards:
 
 
 
 
 
 
Awards granted
 
4.8

 
3.3

 
2.9

Weighted-average grant-date fair value (per award)
 
$
20.06

 
$
19.58

 
$
20.88

Total fair value of vested awards distributed
 
$
112.4

 
$
27.9

 
$
18.7