Revenues Reserves for Discounts and Allowances (Details 1) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 761.6	$ 605.5	$ 662.7
Current provisions relating to sales in current year	3,389.1	2,917.3	2,668.0
Adjustments relating to prior years	(12.1)	6.0	(16.7)
Payments/returns related to sales in current year	(2,440.4)	(2,232.8)	(2,099.5)
Payments/returns related to sales in prior years	(646.9)	(534.4)	(609.0)
Ending balance	1,051.3	761.6	605.5
Discounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	109.6	71.6	56.1
Current provisions relating to sales in current year	679.3	583.0	592.6
Adjustments relating to prior years	(0.3)	(0.1)	(1.4)
Payments/returns related to sales in current year	(551.7)	(475.8)	(522.5)
Payments/returns related to sales in prior years	(109.1)	(69.1)	(53.2)
Ending balance	127.8	109.6	71.6
Contractual Adjustments
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	606.0	482.7	548.7
Current provisions relating to sales in current year	2,686.7	2,307.4	2,044.5
Adjustments relating to prior years	(10.0)	15.0	1.5
Payments/returns related to sales in current year	(1,887.6)	(1,756.9)	(1,576.0)
Payments/returns related to sales in prior years	(506.3)	(442.2)	(536.0)
Ending balance	888.8	606.0	482.7
Returns
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	46.0	51.2	57.9
Current provisions relating to sales in current year	23.1	26.9	30.9
Adjustments relating to prior years	(1.8)	(8.9)	(16.8)
Payments/returns related to sales in current year	(1.1)	(0.1)	(1.0)
Payments/returns related to sales in prior years	(31.5)	(23.1)	(19.8)
Ending balance	$ 34.7	$ 46.0	$ 51.2