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Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2017

Earnings Per Share [Abstract]

Schedule of Reconciliation of the Numerator and Denominator used in the Calculation of Basic and Diluted Earnings per Share

The following is a reconciliation of the numerator and denominator used in the calculation of basic and diluted earnings per share available to common stockholders:

		For the Years Ended December 31,
		2015				2016				2017
Numerator
Net income (controlling interest)		$	509.5			$	472.8			$	689.5
Interest expense on convertible securities, net of taxes		15.3				15.5				15.5
Net income (controlling interest), as adjusted		$	524.8			$	488.3			$	705.0
Denominator
Average shares outstanding (basic)		54.3				54.2				56.0
Effect of dilutive instruments:
Stock options and restricted stock units		0.7				0.6				0.4
Junior convertible securities		2.2				2.2				2.2
Average shares outstanding (diluted)		57.2				57.0				58.6

Schedule of Diluted Earnings per Share Calculations, Excluding the Anti-dilutive Effect of Shares

Average shares outstanding (diluted) in the table above exclude share awards that have not satisfied performance conditions and the anti-dilutive effect of the following shares:

	For the Years Ended December 31,
	2015			2016			2017
Stock options and restricted stock units	0.0			0.6			0.1

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- References

No definition available.

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- Definition

Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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