Earnings per common share (Tables)

3 Months Ended

Mar. 31, 2015

Earnings Per Share [Abstract]

Computations of Basic Earnings Per Common Share

The computations of basic earnings per common share follow:

	Three months ended March 31
	2015			2014
	(in thousands, except per share)
Income available to common shareholders:
Net income	$	241,613			229,017
Less: Preferred stock dividends (a)		(20,318	)		(14,674	)
Net income available to common equity		221,295			214,343
Less: Income attributable to unvested stock-based compensation awards		(2,465	)		(2,623	)
Net income available to common shareholders	$	218,830			211,720
Weighted-average shares outstanding:
Common shares outstanding (including common stock issuable) and unvested stock-based compensation awards		133,542			131,800
Less: Unvested stock-based compensation awards		(1,493	)		(1,588	)
Weighted-average shares outstanding		132,049			130,212
Basic earnings per common share	$	1.66			1.63

(a) Including impact of not as yet declared cumulative dividends.

Computations of Diluted Earnings Per Common Share

The computations of diluted earnings per common share follow:

	Three months ended March 31
	2015			2014
	(in thousands, except per share)
Net income available to common equity	$	221,295			214,343
Less: Income attributable to unvested stock-based compensation awards		(2,458	)		(2,612	)
Net income available to common shareholders	$	218,837			211,731
Adjusted weighted-average shares outstanding:
Common and unvested stock-based compensation awards		133,542			131,800
Less: Unvested stock-based compensation awards		(1,493	)		(1,588	)
Plus: Incremental shares from assumed conversion of stock-based compensation awards		720			914
Adjusted weighted-average shares outstanding		132,769			131,126
Diluted earnings per common share	$	1.65			1.61