Debt - Schedule of Debt and Capital Lease Obligations (Parenthetical) (Details)	1 Months Ended	9 Months Ended	12 Months Ended
Aug. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
4.7% senior notes due 2025
Debt Instrument [Line Items]
Debt instrument, interest rate	4.70%	4.70%
Debt instrument, maturity year	2025	2025
Senior unsecured credit facility \| Revolving loan
Debt Instrument [Line Items]
Debt instrument, maturity year		2019	2019

Contractual interest rate for funds borrowed, under the debt agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant