Restatement of consolidated financial statements - Consolidated Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 642.6	$ 576.1	$ 621.3
Restricted cash	0.0	0.2	0.2
Accounts receivable, net	159.2	278.9
Inventories, net	350.7	344.5
Prepaid expenses and other current assets	57.9	70.2
Total current assets	1,210.4	1,269.9
Property, plant and equipment, net	817.6	800.1
Intangible assets, net	728.8	604.6
Goodwill	218.2	224.9	266.7
Other assets	191.3	58.2
Total assets	3,166.3	2,957.7
Current liabilities:
Accounts payable	103.5	128.9
Accrued expenses	34.9	51.7
Accrued compensation	87.3	88.7
Debt, current portion	957.3	31.6
Other current liabilities	45.9	73.1
Total current liabilities	1,228.9	374.0
Debt, net of current portion	448.5	809.4
Deferred tax liability	59.7	93.3
Other liabilities	41.5	69.5
Total liabilities	1,778.6	1,346.2
Stockholders’ equity:
Preferred stock, $0.001 par value; 15.0 shares authorized, no shares issued and outstanding	0.0	0.0
Common stock, $0.001 par value; 200.0 shares authorized, 55.7 and 55.1 shares issued; 50.1 and 51.3 shares outstanding, respectively.	0.1	0.1
Treasury stock, at cost, 5.6 and 3.8 common shares, respectively	(227.7)	(152.2)
Additional paid-in capital	873.5	829.4
Accumulated other comprehensive income (loss), net	3.1	(16.1)
Retained earnings	738.7	950.3
Total stockholders’ equity	$ 1,387.7	$ 1,611.5	$ 1,450.9	$ 1,091.3
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	15,000,000	15,000,000.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000.0
Common stock, shares issued (in shares)	55,700,000	55,100,000
Common stock, shares outstanding (in shares)	50,100,000	51,300,000
Treasury stock (in shares)	5,600,000	3,800,000
Total liabilities and stockholders’ equity	$ 3,166.3	$ 2,957.7
Previously Reported
Current assets:
Cash and cash equivalents	642.6	576.1	$ 621.3
Restricted cash	0.0	0.2	$ 0.2
Accounts receivable, net	158.4	274.7
Inventories, net	351.8	350.8
Prepaid expenses and other current assets	57.9	70.2
Total current assets	1,210.7	1,272.0
Property, plant and equipment, net	817.6	800.1
Intangible assets, net	728.8	604.6
Goodwill	218.2	224.9
Other assets	191.3	57.4
Total assets	3,166.6	2,959.0
Current liabilities:
Accounts payable	103.5	128.9
Accrued expenses	34.9	51.7
Accrued compensation	88.3	88.7
Debt, current portion	957.3	31.6
Other current liabilities	45.9	72.9
Total current liabilities	1,229.9	373.8
Debt, net of current portion	448.5	809.4
Deferred tax liability	71.8	94.9
Other liabilities	33.4	61.9
Total liabilities	1,783.6	1,340.0
Stockholders’ equity:
Preferred stock, $0.001 par value; 15.0 shares authorized, no shares issued and outstanding	0.0	0.0
Common stock, $0.001 par value; 200.0 shares authorized, 55.7 and 55.1 shares issued; 50.1 and 51.3 shares outstanding, respectively.	0.1	0.1
Treasury stock, at cost, 5.6 and 3.8 common shares, respectively	(227.7)	(152.2)
Additional paid-in capital	873.5	829.4
Accumulated other comprehensive income (loss), net	3.1	(16.1)
Retained earnings	734.0	957.8
Total stockholders’ equity	1,383.0	1,619.0
Total liabilities and stockholders’ equity	3,166.6	2,959.0
Tax Adjustments
Current liabilities:
Other current liabilities	(0.3)
Total current liabilities	(0.3)
Deferred tax liability	(12.1)
Other liabilities	7.1
Total liabilities	(5.3)
Stockholders’ equity:
Retained earnings	5.3
Total stockholders’ equity	5.3
Other Adjustments
Current assets:
Accounts receivable, net	0.8	4.2
Inventories, net	(1.1)	(6.3)
Total current assets	(0.3)	(2.1)
Other assets		0.8
Total assets	(0.3)	(1.3)
Current liabilities:
Accrued compensation	(1.0)
Other current liabilities	0.3	0.2
Total current liabilities	(0.7)	0.2
Deferred tax liability		(1.6)
Other liabilities	1.0	7.6
Total liabilities	0.3	6.2
Stockholders’ equity:
Retained earnings	(0.6)	(7.5)
Total stockholders’ equity	(0.6)	(7.5)
Total liabilities and stockholders’ equity	$ (0.3)	$ (1.3)