Fair Value Measurements - Financial Instruments at Fair Value (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 29, 2024	Dec. 31, 2023
Liabilities:
Goodwill carrying value	$ 3,369.6	$ 3,529.1
Rare Diseases Business
Assets:
Assets held-for-sale, net	147.7
Liabilities:
Total impairment charge	12.0
Rare Diseases reporting unit
Assets:
Goodwill	93.1	118.9
Liabilities:
Goodwill carrying value		208.9
Measured at fair value on a recurring basis | Level 1
Assets:
Investment securities	0.0	0.1
Total assets	0.0	0.1
Liabilities:
Total liabilities	0.0	0.0
Measured at fair value on a recurring basis | Level 1 | Cross-currency swap
Assets:
Derivative assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Measured at fair value on a recurring basis | Level 1 | Foreign currency forward contracts
Assets:
Derivative assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Measured at fair value on a recurring basis | Level 1 | Interest rate swap agreements
Assets:
Derivative assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Measured at fair value on a recurring basis | Level 2
Assets:
Investment securities	0.0	0.0
Total assets	20.4	31.1
Liabilities:
Total liabilities	91.4	186.4
Measured at fair value on a recurring basis | Level 2 | Cross-currency swap
Assets:
Derivative assets	3.3	0.0
Liabilities:
Derivative liabilities	77.5	172.0
Measured at fair value on a recurring basis | Level 2 | Foreign currency forward contracts
Assets:
Derivative assets	2.2	0.6
Liabilities:
Derivative liabilities	2.8	2.7
Measured at fair value on a recurring basis | Level 2 | Interest rate swap agreements
Assets:
Derivative assets	14.9	30.5
Liabilities:
Derivative liabilities	11.1	11.7
Measured at fair value on a recurring basis | Level 3
Assets:
Investment securities	0.0	0.0
Total assets	0.0	0.0
Liabilities:
Total liabilities	0.0	0.0
Measured at fair value on a recurring basis | Level 3 | Cross-currency swap
Assets:
Derivative assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Measured at fair value on a recurring basis | Level 3 | Foreign currency forward contracts
Assets:
Derivative assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Measured at fair value on a recurring basis | Level 3 | Interest rate swap agreements
Assets:
Derivative assets	0.0	0.0
Liabilities:
Derivative liabilities	0.0	0.0
Measured at fair value on a non-recurring basis | Level 1
Assets:
Total assets	0.0	0.0
Goodwill	0.0	0.0
Assets held-for-sale, net	0.0	0.0
Measured at fair value on a non-recurring basis | Level 2
Assets:
Total assets	0.0	0.0
Goodwill	0.0	0.0
Assets held-for-sale, net	0.0	0.0
Measured at fair value on a non-recurring basis | Level 3
Assets:
Total assets	240.8	118.9
Goodwill	93.1	118.9
Assets held-for-sale, net	$ 147.7	$ 0.0