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Held For Sale - Schedule of Components Assets and Liabilities Held for Sale (Detail) $ in Millions	Dec. 31, 2019 USD ($)
Held for Sale [Line Items]
Total assets held for sale	$ 32.9
Total liabilities held for sale	10.5
Clinic Asset Group [Member] | Disposal Group, Held-for-sale [Member]
Held for Sale [Line Items]
Current assets	6.1
Property, plant and equipment, net	19.5
Goodwill	7.3
Total assets held for sale	32.9
Current liabilities	2.8
Other long-term liabilities	7.7
Total liabilities held for sale	$ 10.5

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