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Common and Preferred Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders Equity Note [Abstract]  
Changes in Outstanding Common Shares

The following table provides the changes in our outstanding common shares:

 

 

 

2018

 

 

2017

 

 

2016

 

 

 

(In millions)

 

Balance at January 1

 

 

315.1

 

 

 

316.5

 

 

 

286.0

 

Shares issued

 

 

—

 

 

 

—

 

 

 

28.8

 

Activity related to restricted stock awards, net

 

 

0.8

 

 

 

0.8

 

 

 

1.1

 

Stock options exercised

 

 

0.6

 

 

 

0.2

 

 

 

0.2

 

PSU vested

 

 

0.1

 

 

 

0.2

 

 

 

0.4

 

Shares repurchased

 

 

(25.2

)

 

 

(2.6

)

 

 

—

 

Balance at December 31

 

 

291.4

 

 

 

315.1

 

 

 

316.5