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Stock Options, Restricted Stock and Restricted Stock Units (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		6 Months Ended
	May 31, 2018	Feb. 28, 2018	Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares authorized for grants			500,000
Maximum term of the awards granted under the Plan			10 years
Stock-based compensation cost which has not yet been recognized			$ 22.3
Stock-based compensation cost recognized period, in months			32 months
Restricted stock awarded subject to performance condition			552,000
Restricted stock and restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Number of shares or units		144,577	150,433
Vesting period		4 years
Share Price		$ 90.99
Restricted stock and restricted stock units [Member] | Board Of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grants, Number of shares or units	5,856
Vesting period	3 years
Share Price	$ 103.37

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Name Accounting Standards Codification
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-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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