Internal Investigation and Related Matters (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses	$ 700.5	$ 627.1	$ 2,000.6	$ 1,849.9
Depreciation and amortization expense	91.9	$ 82.5	265.7	$ 238.4
Property and equipment, net	1,323.3		1,323.3		$ 1,271.4
Internal Investigation and Related Matters
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Potential improper payments			5.0
Potential Improper Payments Not Corrected			1.9
Internal Investigation and Related Matters | Restatement Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses	3.1
Depreciation and amortization expense	(0.4)
Property and equipment, net	$ 2.7		$ 2.7