Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Mar. 31, 2022
Assets:
Derivative contracts	$ 1.8
Samsung Bioepis
Liabilities:
Equity, ownership interest	49.90%		49.90%
Fair Value, Measurements Recurring
Assets:
Cash equivalents	$ 1,449.7	$ 610.7
Marketable equity securities	302.7	416.8
Derivative contracts	23.4	11.9
Plan assets for deferred compensation	38.5	37.5
Total	1,816.1	1,506.9
Liabilities:
Derivative contracts	18.6	31.6
Total	18.6	31.6
Fair Value, Measurements Recurring | Samsung Bioepis
Assets:
Other current assets, receivable		430.0
Quoted Prices in Active Markets (Level 1) | Fair Value, Measurements Recurring
Assets:
Cash equivalents	0.0	0.0
Marketable equity securities	302.7	416.8
Derivative contracts	0.0	0.0
Plan assets for deferred compensation	0.0	0.0
Derivative contracts	0.0
Total	302.7	416.8
Liabilities:
Derivative contracts	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
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring
Assets:
Cash equivalents	1,449.7	610.7
Marketable equity securities	0.0	0.0
Derivative contracts	23.4	11.9
Plan assets for deferred compensation	38.5	37.5
Derivative contracts	1.8
Total	1,513.4	660.1
Liabilities:
Derivative contracts	18.6	31.6
Total	18.6	31.6
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements Recurring | Samsung Bioepis
Assets:
Other current assets, receivable		0.0
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
Derivative contracts	0.0
Total	0.0	430.0
Liabilities:
Derivative contracts	0.0	0.0
Total	$ 0.0	0.0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements Recurring | Samsung Bioepis
Assets:
Other current assets, receivable		$ 430.0