Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Lease and rental expense	$ 35.6	$ 42.4	$ 85.1	$ 85.0
Irrevocable standby letters of credit and guarantees	229.3		229.3		$ 224.8
Clinical Testing
Other Commitments [Line Items]
Commitment amount	1,593.6		1,593.6		1,409.9
Contract Manufacturing
Other Commitments [Line Items]
Commitment amount	1,080.2		1,080.2		467.2
Commitments expected to be paid in next year	303.5		303.5
Other Purchasing Commitment
Other Commitments [Line Items]
Commitment amount	1,563.9		1,563.9		1,692.5
Commitments expected to be paid in next year	1,045.1		1,045.1
Investment Commitment
Other Commitments [Line Items]
Commitment amount	49.4		49.4		48.9
Capital Commitment
Other Commitments [Line Items]
Commitment amount	$ 409.3		$ 409.3		$ 328.2