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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Summary of Shares Outstanding
The following table summarizes the shares outstanding for the three years ended December 31, 2014:
 
Common
Stock
 
Treasury
Stock
 
Shares
Outstanding
Balance, Jan. 1, 2012
290,573,068

 
(138,684,288
)
 
151,888,780

Purchases
—

 
(1,000,000
)
 
(1,000,000
)
Issuances
—

 
2,677,517

 
2,677,517

Balance, Dec. 31, 2012
290,573,068

 
(137,006,771
)
 
153,566,297

Increase in treasury stock due to separation and merger transaction (Note 2)
—

 
(10,825,227
)
 
(10,825,227
)
Purchases
—

 
(5,745,529
)
 
(5,745,529
)
Issuances
—

 
1,650,841

 
1,650,841

Balance, Dec. 31, 2013
290,573,068

 
(151,926,686
)
 
138,646,382

Purchases
—

 
(3,813,191
)
 
(3,813,191
)
Issuances
—

 
1,149,092

 
1,149,092

Balance, Dec. 31, 2014
290,573,068

 
(154,590,785
)
 
135,982,283