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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Stock Repurchases Pursuant To Board Of Director Authorizations
The remaining repurchases were made pursuant to the following authorizations (in millions of shares): 
  
 
Shares Repurchased
 
Authorization Remaining
at December 31, 2017
Board of Directors’ Authorization
 
2017
 
2016
 
2015
 
1997 Authorization
 
—

 
—

 
0.9

 
—

2007 Authorization
 
—

 
—

 
0.9

 
—

2014 Authorization
 
—

 
—

 
20.0

 
—

2015 Authorization
 
—

 
9.0

 
6.0

 
—

2016 Authorization
 
8.7

 
0.7

 
—

 
10.6

Total
 
8.7

 
9.7

 
27.8

 
10.6