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Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2020

Share-based Payment Arrangement [Abstract]

Restricted Stock Unit Activity

The following table summarizes information about vested and nonvested RSUs for 2020:

			RSUs
			Shares (in millions)						Weighted-Average Grant Date Fair Value
Nonvested at January 1			1.7						$	40.56
Granted			0.9						$	44.28
Vested			(0.5)						$	42.40
Forfeited			(0.2)						$	44.21
Nonvested at December 31			1.9						$	41.36

Weighted Average Grant-Date Fair Value of Restricted Stock Units Granted and Total Fair Value of Restricted Stock Units Vested

The weighted average grant-date fair value of RSUs and total fair value of RSUs vested are summarized in the following table:

			2020						2019						2018
Weighted average grant-date fair value of RSUs granted			$	44.28					$	35.51					$	49.16
Total fair value of RSUs vested (in millions)			$	23.2					$	9.0					$	7.3

Stock Option Activity

The following table summarizes stock option activity during 2020:

			Stock Options
			Shares (in millions)						Weighted- Average Exercise Price						Weighted- Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value (in millions)
Options outstanding at January 1			2.6						$	52.29
Granted			—						$	—
Exercised			(1.1)						$	49.91
Forfeited			—						$	—
Expired			(0.3)						$	58.00
Options outstanding and exercisable as of December 31			1.2						$	52.78					3.53						$	19.7
Options available for future grants at December 31			3.1

Restricted Stock Activity

The following table summarizes information about restricted stock for 2020:

			Restricted Stock
			Shares (in actual number of shares)						Weighted-Average Grant Date Fair Value
Nonvested at January 1			16,267						$	52.53
Granted			—						$	—
Vested			(16,189)						$	52.53
Forfeited			(78)						$	52.53
Nonvested at December 31			—						$	—

Total Stock-Based Compensation Expense

The following table summarizes the total stock-based compensation expense recognized in Selling, General, and Administrative Expenses in the Consolidated Statements of Income and the total recognized tax benefit related thereto:

			2020						2019						2018
RSUs			$	30.0					$	29.4					$	21.7
Stock options			0.1						0.9						1.6
Restricted stock			0.1						0.8						2.2
Total stock-based compensation expense			$	30.2					$	31.1					$	25.5
Tax benefit related to stock-based compensation expense			$	2.6					$	2.5					$	3.0

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