Integration and Acquisition Costs (Summary of Employee Termination Related Reserve and Other) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017 USD ($)
Restructuring Reserve [Roll Forward]
As of January 1,	$ 74.0
Amount charged to integration costs	215.8
Paid/utilized	(148.4)
As of September 30,	141.4
Severance and employee benefits
Restructuring Reserve [Roll Forward]
As of January 1,	74.0
Amount charged to integration costs	157.5
Paid/utilized	(140.9)
As of September 30,	90.6
Lease terminations
Restructuring Reserve [Roll Forward]
As of January 1,	0.0
Amount charged to integration costs	58.3
Paid/utilized	(7.5)
As of September 30,	$ 50.8