Other Long-Term Liabilities - Deferred Compensation (Details) - USD ($) $ in Millions	9 Months Ended
Sep. 30, 2017	Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation plan, employer matching contribution (percent)	4.00%
Deferred compensation plan, compensation deferral period	10 years
Deferred compensation arrangement, compensation distribution period	10 years
Cash and Cash Equivalents
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation, Rabbi Trust	$ 13.4	$ 11.7
Short-term Investments
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Deferred compensation, Rabbi Trust	$ 3.6	$ 2.6

Deferred Compensation Arrangement, Employer Matching Contribution, Percent of Match

No definition available.

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- Definition

Deferred Compensation Plan, Compensation Deferral Period

+ References

No definition available.

+ Details

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- Definition

Maximum term of the deferred compensation arrangement, 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 710
-SubTopic 10
-Section 55
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6409961&loc=d3e20487-108367

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements. Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

+ References

No definition available.

+ Details

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