Earnings Per Common Share (Calculations) (Details) - shares
shares in Millions |
3 Months Ended |
9 Months Ended |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
| Earnings Per Share, Diluted [Abstract] |
|
|
|
|
| Weighted average common shares outstanding |
266.3
|
271.1
|
267.0
|
272.2
|
| Effect of dilutive securities: |
|
|
|
|
| Stock options |
0.0
|
0.9
|
0.8
|
1.0
|
| Other stock compensation plans |
0.0
|
1.1
|
1.0
|
1.2
|
| Potentially dilutive common shares |
0.0
|
2.0
|
1.8
|
2.2
|
| Adjusted weighted average common shares outstanding |
266.3
|
273.1
|
268.8
|
274.4
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
|
|
| Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect |
2.4
|
0.6
|
0.6
|
0.6
|
| Employee Stock Option [Member] |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
|
|
| Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect |
0.6
|
0.6
|
0.6
|
0.6
|
| Stock Compensation Plan [Member] |
|
|
|
|
| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |
|
|
|
|
| Outstanding stock options excluded from the computation of diluted earnings per share due to their antidilutive effect |
1.8
|
0.0
|
0.0
|
0.0
|