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Landfill and Environmental Costs (Expected Undiscounted Future Payments for Remediation Costs) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Environmental Remediation Obligations [Abstract]  
2016 $ 62.4
2017 89.3
2018 62.9
2019 64.8
2020 62.4
Thereafter 546.5
Total expected undiscounted future payments for remediation $ 888.3