Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Lease and rental expense	$ 47.6	$ 42.6
Irrevocable standby letters of credit and guarantees	223.0		$ 224.8
Clinical Testing
Other Commitments [Line Items]
Commitment amount	1,420.6		1,409.9
Contract Manufacturing
Other Commitments [Line Items]
Commitment amount	330.0		467.2
Commitments expected to be paid in next year	227.1
Other Purchasing Commitment
Other Commitments [Line Items]
Commitment amount	1,521.8		1,692.5
Commitments expected to be paid in next year	1,169.0
Investment Commitment
Other Commitments [Line Items]
Commitment amount	54.7		48.9
Capital Commitment
Other Commitments [Line Items]
Commitment amount	$ 405.2		$ 328.2