Selected Quarterly Financial Data Selected Quarterly Financial Data (unaudited) (Details Textual) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | ||||
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Sep. 30, 2013
|
Jun. 30, 2013
|
Mar. 31, 2013
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Dec. 31, 2014
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Mar. 31, 2014
|
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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 |