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Business Segment, Geographic Area, and Significant Customer Information - Reconciliation of Segment Assets to Consolidated Total Assets (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Segment Reporting, Asset Reconciling Item [Line Items]    
Total segment assets $ 993.8 $ 894.1
Cash and cash equivalents 633.3 608.3
Other current assets 121.5 74.3
Property, plant and equipment, net 316.8 284.3
Right-of-use assets 184.5 184.4
Other assets and long-term investments 47.6 45.6
Consolidated total assets 4,365.9 3,903.8
Segment Reconciling Items [Member]    
Segment Reporting, Asset Reconciling Item [Line Items]    
Cash and cash equivalents 879.6 836.0
Other current assets 121.5 74.3
Property, plant and equipment, net 316.8 284.3
Right-of-use assets 184.5 184.4
Goodwill and intangible assets, net 1,815.7 1,578.6
Other assets and long-term investments 54.0 52.1
Consolidated total assets $ 4,365.9 $ 3,903.8