The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859

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

Selected Quarterly Financial Data Selected Quarterly Financial Data (unaudited) (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Mar. 31, 2014
Environmental Exit Cost [Line Items]
Charges related to our withdrawal from the Central States, Southeast and Southwest Areas Pension Fund	$ 38.7	$ 42.0	$ 57.9
Bridgeton Closed Landfill [Member]
Environmental Exit Cost [Line Items]
Environmental remediation charge		$ 108.7		$ 174.5	$ 36.1