Business Segment, Geographic Area, Product/Service Offerings and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Asset Reconciling Item [Line Items]
Total segment assets	$ 894.1	$ 803.2
Cash and cash equivalents	608.3	414.6
Other current assets	74.3	106.3
Property, plant and equipment, net	284.3	241.9
Right-of-use assets	184.4	64.5
Other assets and long-term assets	45.6	47.5
Consolidated total assets	3,903.8	3,416.3
Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Cash and cash equivalents	836.0	524.0
Other current assets	74.3	106.3
Property, plant and equipment, net	284.3	241.9
Right-of-use assets	184.4	64.5
Goodwill and intangible assets, net	1,578.6	1,623.1
Other assets and long-term assets	52.1	53.3
Consolidated total assets	$ 3,903.8	$ 3,416.3