Integration and Acquisition Costs (Summary of Employee Termination Related Reserve and Other) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017 USD ($)
Restructuring Reserve [Roll Forward]
As of January 1,	$ 74.0
Amount charged to integration costs	139.4
Paid/utilized	(78.7)
As of June 30,	134.7
Severance and employee benefits
Restructuring Reserve [Roll Forward]
As of January 1,	74.0
Amount charged to integration costs	97.7
Paid/utilized	(74.6)
As of June 30,	97.1
Lease terminations
Restructuring Reserve [Roll Forward]
As of January 1,	0.0
Amount charged to integration costs	41.7
Paid/utilized	(4.1)
As of June 30,	$ 37.6