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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2020

Stock-Based Compensation Plans

Stock-Based Compensation Disclosures (Table)

​

​	​	​	​	​	​	​	​	​	​	​
​	​	For the year ended December 31,
​		2020			2019			2018
​	​	(in millions)
Compensation cost	​	$	86.7	​	$	78.7	​	$	77.5	​
Related income tax benefit	​	​	17.1	​		16.8	​		16.7	​
Capitalized as part of an asset	​	​	1.5	​		1.7	​		1.9	​

Nonqualified Stock Options Status (Table)

​

​	​	​	​	​	​	​	​	​	​
​	​	​	​	Weighted-		​	​	​
​	​	​	​	average		​	​	​
​		Number of options		exercise price			Intrinsic value
​	​	(in millions)	​	​	​	​	(in millions)
Options outstanding as of January 1, 2020		5.3	​	$	48.42	​	​	​	​
Granted	​	1.4	​	​	51.73	​	​	​	​
Exercised	​	0.1	​	​	29.56	​	​	​	​
Canceled	​	0.1	​	​	51.81	​	​	​	​
Options outstanding as of December 31, 2020	​	6.5	​	$	49.52	​	$	27.5	​
Options vested or expected to vest as of December 31, 2020	​	6.5	​	$	49.52	​	$	27.5	​
Options exercisable as of December 31, 2020	​	4.2	​	$	47.38	​	$	27.5	​

Nonqualified Stock Options Remaining Contractual Lives and Range of Exercise Prices (Table)

​

​	​	​	​	​	​
​	​	​	​	Weighted-
​	​	Number of options	​	average remaining
Range of exercise prices		outstanding		contractual life
​	​	(in millions)	​	​
$27.46 - $41.13	​	1.6	​	3.3	​
$41.14 - $51.53	​	1.0	​	3.7	​
$51.54 - $52.41	​	1.3	​	9.1	​
$52.42 - $62.75	​	1.2	​	8.1	​
$62.76 - $63.98	​	1.4	​	6.7	​
$27.46 - $63.98	​	6.5	​	​	​

Nonqualified Stock Options Fair Value (Table)

​

​	​	​	​	​	​	​	​	​	​	​
​	​	For the year ended December 31,
Options		2020			2019			2018
Expected volatility	​	​	25.7	%	​	23.3	%	​	26.0	%
Expected term (in years)	​	​	7.0	​	​	7.0	​	​	7.0	​
Risk-free interest rate	​	​	1.3	%	​	2.6	%	​	2.8	%
Expected dividend yield	​	​	4.33	%	​	4.07	%	​	3.19	%
Weighted average estimated fair value	​	$	9.64	​	$	10.00	​	$	14.85	​

Nonvested Performance Share Awards Activity (Table)

​

​	​	​	​	​	​	​
​	​	Number of	​	Weighted-
​	​	performance	​	average grant-date
​		share awards		fair value
​	​	(in millions)	​	​	​
Nonvested performance share awards as of January 1, 2020		0.5	​	$	59.26	​
Granted	​	0.3	​	​	51.73	​
Vested	​	0.1	​	​	62.78	​
Nonvested performance share awards as of December 31, 2020	​	0.7	​	$	55.28	​

Nonvested Restricted Stock Units Activity (Table)

​

​	​	​	​	​	​	​
​	​	Number of	​	Weighted-
​	​	restricted	​	average grant-date
​		stock units		fair value
​	​	(in millions)	​	​	​
Nonvested restricted stock units as of January 1, 2020		2.6	​	$	59.15	​
Granted	​	1.1	​	​	50.49	​
Vested	​	0.8	​	​	62.32	​
Canceled	​	0.1	​	​	55.68	​
Nonvested restricted stock units as of December 31, 2020	​	2.8	​	$	54.86	​

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