Stockholders' Equity and Earnings (Loss) Per Common Share (Tables)

9 Months Ended

Sep. 30, 2018

Stockholders' Equity and Earnings Per Common Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

Earnings (Loss) Per Common Share

Net income (loss) per common share is determined as follows:

	Three Months Ended September 30					Nine Months Ended September 30
	2018			2017		2018		2017
	(in millions of dollars, except share data)
Numerator
Net Income (Loss)	$	(284.7	)	$	252.3	$	274.3	$	727.3
Denominator (000s)
Weighted Average Common Shares - Basic	218,892.8			225,288.1		220,513.1		227,375.5
Dilution for Assumed Exercises of Stock Options and Nonvested Stock Awards	—			741.7		433.2		805.0
Weighted Average Common Shares - Assuming Dilution	218,892.8			226,029.8		220,946.3		228,180.5
Net Income (Loss) Per Common Share
Basic	$	(1.30	)	$	1.12	$	1.24	$	3.20
Assuming Dilution	$	(1.30	)	$	1.12	$	1.24	$	3.19

Treasury Stock Transactions

Common Stock

During the second quarter of 2018, our board of directors authorized the repurchase of up to $750.0 million of Unum Group's outstanding common stock through November 24, 2019. This authorization replaced the previous authorization of $750.0 million that was scheduled to expire on November 25, 2018. The remaining repurchase amount under the new program was $650.0 million at September 30, 2018.

Common stock repurchases, which are accounted for using the cost method and classified as treasury stock until otherwise retired, were as follows:

	Three Months Ended September 30				Nine Months Ended September 30
	2018		2017		2018		2017
	(in millions)
Shares Repurchased	—		2.0		4.4		6.3
Cost of Shares Repurchased (1)	$	—	$	100.2	$	200.3	$	300.3

(1) Includes commissions of $0.1 million for the three months ended September 30, 2017, and $0.2 million for each of the nine months ended September 30, 2018 and 2017.