Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions	6 Months Ended
Jun. 30, 2015 USD ($) segment	Dec. 31, 2014 USD ($)
Accounting Policies [Abstract]
Interest in subsidiary (less than given percentage)	100.00%
Number of reportable segments \| segment	1
Payment terms of accounts receivable arising from product sales
Minimum term for accounts receivable	30 days
Maximum term for accounts receivable	90 days
Accumulated depreciation	$ 1,274.2	$ 1,186.4

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.14)

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

Name:	us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant