Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Assets:
Marketable debt securities	$ 2,095.8		$ 2,433.1
Samsung Bioepis
Liabilities:
Equity, ownership interest	49.90%
Fair Value, Measurements Recurring
Assets:
Cash equivalents	$ 3,191.8		1,632.2
Marketable equity securities	896.0		1,048.5
Derivative contracts	195.9		80.9
Plan assets for deferred compensation	32.2		33.4
Total	7,605.3		5,228.1
Liabilities:
Derivative contracts	22.8		10.8
Contingent consideration obligations	195.4	$ 197.5	209.1	$ 210.7	$ 226.3	$ 259.8
Total	218.2		219.9
Fair Value, Measurements Recurring | Samsung Bioepis
Assets:
Other current assets, receivable	790.8
Other assets, receivable	402.8
Fair Value, Measurements Recurring | Corporate debt securities
Assets:
Marketable debt securities	1,219.1		1,108.2
Fair Value, Measurements Recurring | Government securities
Assets:
Marketable debt securities	702.0		1,192.7
Fair Value, Measurements Recurring | Mortgage and other asset backed securities
Assets:
Marketable debt securities	174.7		132.2
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring
Assets:
Cash equivalents	0.0		0.0
Marketable equity securities	896.0		181.7
Derivative contracts	0.0		0.0
Plan assets for deferred compensation	0.0		0.0
Total	896.0		181.7
Liabilities:
Derivative contracts	0.0		0.0
Contingent consideration obligations	0.0		0.0
Total	0.0		0.0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring | Samsung Bioepis
Assets:
Other current assets, receivable	0.0
Other assets, receivable	0.0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring | Corporate debt securities
Assets:
Marketable debt securities	0.0		0.0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring | Government securities
Assets:
Marketable debt securities	0.0		0.0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring | Mortgage and other asset backed securities
Assets:
Marketable debt securities	0.0		0.0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring
Assets:
Cash equivalents	3,191.8		1,632.2
Marketable equity securities	0.0		866.8
Derivative contracts	195.9		80.9
Plan assets for deferred compensation	32.2		33.4
Total	5,515.7		5,046.4
Liabilities:
Derivative contracts	22.8		10.8
Contingent consideration obligations	0.0		0.0
Total	22.8		10.8
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring | Samsung Bioepis
Assets:
Other current assets, receivable	0.0
Other assets, receivable	0.0
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring | Corporate debt securities
Assets:
Marketable debt securities	1,219.1		1,108.2
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring | Government securities
Assets:
Marketable debt securities	702.0		1,192.7
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring | Mortgage and other asset backed securities
Assets:
Marketable debt securities	174.7		132.2
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring
Assets:
Cash equivalents	0.0		0.0
Marketable equity securities	0.0		0.0
Derivative contracts	0.0		0.0
Plan assets for deferred compensation	0.0		0.0
Total	1,193.6		0.0
Liabilities:
Derivative contracts	0.0		0.0
Contingent consideration obligations	195.4		209.1
Total	195.4		209.1
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring | Samsung Bioepis
Assets:
Other current assets, receivable	790.8
Other assets, receivable	402.8
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring | Corporate debt securities
Assets:
Marketable debt securities	0.0		0.0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring | Government securities
Assets:
Marketable debt securities	0.0		0.0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring | Mortgage and other asset backed securities
Assets:
Marketable debt securities	$ 0.0		$ 0.0