Business Acquisitions and Restructuring Charges - Acquisitions Narrative (Details) $ in Millions	6 Months Ended		12 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) facility
Business Acquisition [Line Items]
Cash used in acquisitions, net of cash acquired	$ 13.9	$ 512.6
Goodwill	11,154.2		$ 11,145.5
Tervita
Business Acquisition [Line Items]
Cash used in acquisitions, net of cash acquired			$ 476.6
Number of types of waste management and disposal facilities | facility			3
Property and equipment	109.3
Landfill airspace	85.5
Other intangible assets	7.2
Net working capital	21.0
Closure and post-closure liabilities	6.9
Environmental remediation liabilities	7.6
Goodwill	$ 268.0