Landfill and Environmental Costs - Accrued Landfill and Environmental Costs (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Environmental Remediation Obligations [Abstract]
Landfill final capping, closure and post-closure liabilities	$ 1,203.7	$ 1,181.6	$ 1,183.0	$ 1,144.3
Environmental remediation liabilities	626.7	646.1	$ 680.4	$ 697.5
Total accrued landfill and environmental costs	1,830.4	1,827.7
Less: current portion	(168.2)	(149.8)
Long-term portion	$ 1,662.2	$ 1,677.9