Fair Value Measurements - Financial Instruments at Fair Value (Details) - USD ($) $ in Millions	Mar. 30, 2024	Dec. 31, 2023
Liabilities:
Goodwill carrying value	$ 3,492.9	$ 3,529.1
Rare Diseases reporting unit
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
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	51.1	31.1
Liabilities:
Total liabilities	137.8	186.4
Measured at fair value on a recurring basis | Level 2 | Cross-currency swap
Liabilities:
Derivative liabilities	130.5	172.0
Measured at fair value on a recurring basis | Level 2 | Foreign currency forward contracts
Assets:
Derivative assets	1.9	0.6
Liabilities:
Derivative liabilities	2.6	2.7
Measured at fair value on a recurring basis | Level 2 | Interest rate swap agreements
Assets:
Derivative assets	49.2	30.5
Liabilities:
Derivative liabilities	4.7	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
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
Measured at fair value on a non-recurring basis | Level 2
Assets:
Total assets	0.0	0.0
Goodwill	0.0	0.0
Measured at fair value on a non-recurring basis | Level 3
Assets:
Total assets	0.0	118.9
Goodwill	$ 0.0	118.9
Measured at fair value on a non-recurring basis | Level 3 | Rare Diseases reporting unit
Assets:
Goodwill		$ 118.9