Financial Instruments and Risk Management (Rollforward of Contingent Consideration) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017
Schedule of Activity in Contingent Consideration [Roll Forward]
Balance at beginning of period		$ 453.7	$ 564.6
Payments		82.9	77.5	[1]
Accretion		19.8	25.9
Reclassifications		0.0	0.0
Fair value loss (gain)	[1]	(35.3)	(59.3)
Balance at end of period		355.3	453.7
Other current liabilities
Schedule of Activity in Contingent Consideration [Roll Forward]
Balance at beginning of period		167.8	256.9	[2]
Payments	[2]	82.9	77.3	[1]
Accretion	[2]	0.0	0.0
Reclassifications	[2]	62.1	27.0
Fair value loss (gain)	[1],[2]	11.3	(38.8)
Balance at end of period		158.3	167.8
Other Noncurrent Liabilities
Schedule of Activity in Contingent Consideration [Roll Forward]
Balance at beginning of period		285.9	307.7	[3]
Payments	[3]	0.0	0.2	[1]
Accretion	[3]	19.8	25.9
Reclassifications	[3]	(62.1)	(27.0)
Fair value loss (gain)	[1],[3]	(46.6)	(20.5)
Balance at end of period		$ 197.0	$ 285.9

[1] Included in litigation settlements and other contingencies, net in the Consolidated Statements of Operations.

[2] Included in other current liabilities on the Consolidated Balance Sheets.

[3] Included in other long-term obligations on the Consolidated Balance Sheets.