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Common Equity (Tables)

12 Months Ended

Dec. 31, 2018

Stockholders' Equity Note [Abstract]

Schedule of stock-based compensation expense and related deferred tax benefit recognized in income

The following table summarizes our pre-tax stock-based compensation expense and the related tax benefit recognized in income for the years ended December 31:

(in millions)		2018				2017				2016
Stock options		$	5.2			$	3.4			$	3.5
Restricted stock		10.7				5.4				5.8
Performance units		20.2				20.2				8.7
Stock-based compensation expense		$	36.1			$	29.0			$	18.0
Related tax benefit		$	9.9			$	11.6			$	7.2

Schedule of stock option activity

The following is a summary of our stock option activity during 2018:

Stock Options		Number of Options			Weighted-Average Exercise Price				Weighted-Average Remaining Contractual Life (in years)		Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2018		4,644,214			$	43.11
Granted		710,710			$	65.59
Exercised		(899,391	)		$	32.39
Forfeited		(3,000	)		$	57.99
Outstanding as of December 31, 2018		4,452,533			$	48.86			6.1		$	90.8
Exercisable as of December 31, 2018		2,838,609			$	42.77			4.9		$	75.2

Schedule of restricted stock activity

The following restricted stock activity occurred during 2018:

Restricted Shares		Number of Shares			Weighted-Average Grant Date Fair Value
Outstanding and unvested as of January 1, 2018		204,488			$	54.94
Granted		156,340			$	64.20
Released		(121,060	)		$	54.97
Forfeited		(5,141	)		$	58.68
Outstanding and unvested as of December 31, 2018		234,627			$	61.01

Schedule of shares repurchased

The following is a summary of shares purchased to fulfill exercised stock options and restricted stock awards during the years ended December 31:

(in millions)		2018				2017				2016
Shares purchased		1.1				1.1				1.8
Cost of shares purchased		$	72.4			$	71.3			$	108.0

Schedule of dividends declared

During the year ended December 31, 2018, our Board of Directors declared common stock dividends which are summarized below:

Date Declared		Date Payable		Per Share		Period
January 18, 2018		March 1, 2018		$0.5525		First quarter
April 19, 2018		June 1, 2018		$0.5525		Second quarter
July 19, 2018		September 1, 2018		$0.5525		Third quarter
October 18, 2018		December 1, 2018		$0.5525		Fourth quarter

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