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Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2024

Stock-Based Compensation Plans

Stock-Based Compensation Disclosures (Table)

​

​	​	​	​	​	​	​	​	​	​	​
​	​	For the year ended December 31,
​		2024			2023			2022
​	​	(in millions)
Compensation cost	​	$	106.8	​	$	97.7	​	$	89.9	​
Related income tax benefit	​	​	23.9	​		23.1	​		20.3	​
Capitalized as part of an asset	​	​	1.1	​		1.1	​		1.3	​

Nonqualified Stock Options Status (Table)

​

​	​	​	​	​	​	​	​	​	​
​	​	​	​	Weighted-		​	​	​
​	​	​	​	average		​	​	​
​		Number of options		exercise price			Intrinsic value
​	​	(in millions)	​	​	​	​	(in millions)
Options outstanding as of January 1, 2024		2.8	​	$	55.39	​	​	​	​
Exercised	​	0.7	​	​	53.47	​	​	​	​
Options outstanding as of December 31, 2024	​	2.1	​	$	56.03	​	$	45.4	​
Options vested or expected to vest as of December 31, 2024	​	2.1	​	$	56.03	​	$	45.4	​
Options exercisable as of December 31, 2024	​	2.1	​	$	56.03	​	$	45.4	​

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)	​	​
$37.38 - $52.41	​	0.7	​	4.6	​
$52.42 - $55.89	​	0.4	​	4.2	​
$55.90 - $60.70	​	0.5	​	6.2	​
$60.71 - $63.38	​	0.1	​	2.2	​
$63.39 - $63.98	​	0.4	​	3.2	​
$37.38 - $63.98	​	2.1	​	​	​

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, 2024		0.8	​	$	71.66	​
Granted	​	0.3	​	​	82.52	​
Vested	​	0.1	​	​	58.68	​
Canceled	​	0.1	​	​	78.51	​
Nonvested performance share awards as of December 31, 2024	​	0.9	​	$	77.38	​

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, 2024		3.0	​	$	71.83	​
Granted	​	1.1	​	​	80.25	​
Vested	​	1.0	​	​	59.32	​
Canceled	​	0.1	​	​	78.52	​
Nonvested restricted stock units as of December 31, 2024	​	3.0	​	$	78.92	​

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