Property and Equipment - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended	12 Months Ended
Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]
Depreciation	$ 26.2us-gaap_Depreciation	$ 26.4us-gaap_Depreciation	$ 25.9us-gaap_Depreciation	$ 26.0us-gaap_Depreciation	$ 25.9us-gaap_Depreciation	$ 26.7us-gaap_Depreciation	$ 26.8us-gaap_Depreciation	$ 26.5us-gaap_Depreciation	$ 79.3us-gaap_Depreciation	$ 78.3us-gaap_Depreciation	$ 104.5us-gaap_Depreciation	$ 105.9us-gaap_Depreciation	$ 109.0us-gaap_Depreciation

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Name:	us-gaap_Depreciation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration