Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Total revenues	$ 1,444.6	$ 1,203.3	$ 2,889.4	$ 2,343.7
Interest expense	$ (23.6)	(18.3)	(49.4)	(38.2)
Designated as Hedging Instrument
Derivative [Line Items]
Foreign Exchange Forward Contracts Term	60 months
Not Designated as Hedging Instrument
Derivative [Line Items]
Foreign Exchange Forward Contracts Term	7 months
Gain reclassified from AOCI to net product sales, net of tax	$ (3.2)	(5.8)	13.0	(2.6)
Foreign exchange forward contracts | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative instruments	802.1		802.1
Foreign exchange forward contracts | Designated as Hedging Instrument | Revenue
Derivative [Line Items]
Estimated gains (losses) to be reclassified from other comprehenisve income in next 12 months	11.3
Foreign exchange forward contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative instruments	1,936.4		1,936.4
Foreign Exchange Forward, Open Expense | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative instruments	11.3		11.3
Interest Rate Swap Two | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative instruments	$ 450.0		$ 450.0
Interest Rate Swap Two | Designated as Hedging Instrument | Minimum
Derivative [Line Items]
Fixed interest borrowing spreads	0.026%		0.026%
Interest Rate Swap Two | Designated as Hedging Instrument | Maximum
Derivative [Line Items]
Fixed interest borrowing spreads	0.0279%		0.0279%
Interest rate contracts | Designated as Hedging Instrument
Derivative [Line Items]
Estimated gains (losses) to be reclassified from other comprehenisve income in next 12 months	$ (45.5)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) from Hedging Activities
Derivative [Line Items]
Total revenues	9.5	9.1	$ 20.9	16.1
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) from Hedging Activities | Foreign exchange forward contracts
Derivative [Line Items]
Total revenues	9.5	9.1	20.9	16.1
Interest expense	0.0	0.0	0.0	0.0
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) from Hedging Activities | Interest rate contracts
Derivative [Line Items]
Total revenues	0.0	0.0	0.0	0.0
Interest expense	(10.0)	4.5	(14.6)	9.1
Net Product Sales
Derivative [Line Items]
Total revenues	$ 1,444.5	$ 1,202.5	$ 2,889.1	$ 2,342.7