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Earnings Per Common Share - Additional Information (Details) - $ / shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Earnings Per Share [Abstract]
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share (in shares)	0.7	0.5	0.6	0.5
Antidilutive securities excluded from earnings per share, average exercise price (in dollars per share)	$ 42.16	$ 39.38	$ 42.66	$ 39.38

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- Definition

Share Based Compensation Shares Authorized Under Stock Option Plan Exercise Price Range Exercisable Options Weighted Average Exercise Price

+ References

No definition available.

+ Details

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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- References

No definition available.

+ Details

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