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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows (used in) provided by operating activities:    
Net income $ 74.3 $ 80.2
Adjustments to reconcile to net income to net cash (used in) provided by operating activities:    
Share-based compensation expense 21.9 31.0
Depreciation and amortization 61.9 56.8
Change in fair value of contingent consideration, net 1.7 1.1
Amortization of deferred financing costs 2.0 1.5
Deferred income taxes (3.2) (3.7)
Other 2.0 1.1
Changes in operating assets and liabilities:    
Accounts receivable (34.7) 12.1
Inventories (79.7) (13.7)
Prepaid expenses and other assets (2.4) (16.9)
Accounts payable 8.0 (14.5)
Accrued expenses and other liabilities (55.4) 25.0
Accrued compensation (21.4) (3.4)
Contract liabilities 0.4 29.1
Net cash (used in) provided by operating activities: (24.6) 185.7
Cash flows used in investing activities:    
Purchases of property, plant and equipment (123.1) (59.3)
Milestone payment from prior asset acquisition 0.0 (10.0)
Net cash used in investing activities: (123.1) (69.3)
Cash flows used in financing activities:    
Principal payments on revolving credit facility 0.0 (20.0)
Principal payments on term loan facility (11.3) (5.6)
Principal payments on convertible senior notes (10.6) 0.0
Proceeds from share-based compensation activity 10.0 23.1
Taxes paid for share-based compensation activity (13.0) (11.7)
Contingent consideration payments (1.1) (1.1)
Net cash used in financing activities: (26.0) (15.3)
Effect of exchange rate changes on cash, cash equivalents and restricted cash (0.1) (0.1)
Net change in cash, cash equivalents and restricted cash (173.8) 101.0
Cash, cash equivalents and restricted cash at beginning of period 621.5 168.0
Cash, cash equivalents and restricted cash at end of period 447.7 269.0
Supplemental disclosure of cash flow information:    
Cash paid during the period for interest 15.5 11.6
Cash paid during the period for income taxes 50.3 12.2
Supplemental information on non-cash investing and financing activities:    
Purchases of property, plant and equipment unpaid at period end 31.7 16.8
Reconciliation of cash and cash equivalent and restricted cash at June 30, 2021 and December 31, 2020:    
Cash and cash equivalents 447.5  
Restricted cash 0.2  
Total cash, cash equivalents and restricted cash $ 447.7 $ 269.0