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Share-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-Based Compensation

The following table presents share-based compensation expense:

	For the Three Months Ended March 31,
	2018				2019
Share-based compensation	$	10.7			$	8.8
Tax benefit	2.7				1.8

Schedule of Company Stock Option Transactions

The following table summarizes transactions in the Company’s stock options:

	Stock Options			Weighted Average Exercise Price				Weighted Average Remaining Contractual Life (Years)
Unexercised options outstanding - December 31, 2018	0.5			$	130.81
Options granted	0.0			110.02
Options exercised	(0.0)			107.63
Options forfeited	(0.0)			122.67
Unexercised options outstanding - March 31, 2019	0.5			130.54				3.7
Exercisable at March 31, 2019	0.4			129.01				3.4

Schedule of Fair Value of Options Granted and Assumptions

The weighted average grant date assumptions used to estimate the fair value of options granted were as follows:

		For the Three Months Ended March 31,
		2018			2019
Dividend yield		0.7	%		1.2	%
Expected volatility		24.6	%		31.9	%
Risk-free interest rate		2.6	%		2.6	%
Expected life of options (in years)		5.7			5.7
Forfeiture rate		—	%		—	%

Schedule of Company Restricted Stock Units Transactions

The following table summarizes transactions in the Company’s restricted stock units:

	Restricted Stock Units			Weighted Average Grant Date Value
Unvested units - December 31, 2018	0.6			$	172.74
Units granted	0.3			110.02
Units vested	(0.2	)		169.93
Units forfeited	(0.0)			156.63
Unvested units - March 31, 2019	0.7			145.80

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
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Tabular disclosure of the changes in outstanding nonvested shares.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Tabular disclosure for share-based compensation plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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