Revenues Revenues (Details Textual) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Disaggregation of Revenue [Line Items]
Other Revenues	$ 3,489.8	$ 3,131.1
Distributor One
Disaggregation of Revenue [Line Items]
Percentage of revenues from major distributors	31.30%	34.00%
Distributor Two
Disaggregation of Revenue [Line Items]
Percentage of revenues from major distributors	14.20%	15.90%
Other
Disaggregation of Revenue [Line Items]
Other Revenues	$ 292.4	$ 164.4
Other | Bioverativ
Disaggregation of Revenue [Line Items]
Other Revenues	$ 206.8	$ 47.0