Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows provided by operating activities:
Net income (loss)	$ 80.2	$ (35.6)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Stock-based compensation expense	31.0	14.9
Depreciation and amortization	56.8	55.1
Amortization of deferred financing costs	1.5	1.5
Deferred income taxes	(3.7)	(1.3)
Change in fair value of contingent consideration, net	1.1	5.5
Other	1.1	2.9
Changes in operating assets and liabilities:
Accounts receivable	12.1	44.6
Inventories	(13.7)	(26.1)
Prepaid expenses and other assets	(16.9)	(44.9)
Accounts payable	(14.5)	42.6
Accrued expenses	25.0	6.9
Accrued compensation	(3.4)	(13.5)
Contract liabilities	29.1	16.4
Net cash provided by operating activities:	185.7	69.0
Cash flows used in investing activities:
Purchases of property, plant and equipment and other	(59.3)	(35.5)
Milestone payment from prior asset acquisition	(10.0)	(10.0)
Net cash used in investing activities:	(69.3)	(45.5)
Cash flows (used in) provided by financing activities:
Proceeds from revolving credit facility	0.0	130.0
Principal payments on revolving credit facility	(20.0)	(80.0)
Principal payments on term loan facility	(5.6)	(5.6)
Proceeds from exercise of stock options	23.1	4.6
Taxes paid for share-based compensation activity	(11.7)	(6.3)
Contingent consideration payments	(1.1)	(1.0)
Net cash (used in) provided by financing activities:	(15.3)	41.7
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(0.1)	0.0
Net increase in cash, cash equivalents and restricted cash	101.0	65.2
Cash, cash equivalents and restricted cash at beginning of period	168.0	112.4
Cash, cash equivalents and restricted cash at end of period	269.0	177.6
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	11.6	18.3
Cash paid during the period for income taxes	12.2	13.4
Supplemental information on non-cash investing and financing activities:
Purchases of property, plant and equipment unpaid at period end	16.8	11.4
Reconciliation of cash and cash equivalent and restricted cash
Total cash, cash equivalents and restricted cash	$ 269.0	$ 177.6