Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Accounts Payable and Accrued Liabilities, Current [Abstract]
Accounts payable and accrued purchases	$ 911.9	$ 441.4
Accrued employee compensation and benefits payable	574.8	254.5
Accrued rebates	1,431.3	982.4
Accrued sales returns	118.4	128.3
Other accrued expenses	1,276.0	244.0
Accounts payable and accrued expenses, total	$ 4,312.4	$ 2,050.6