UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF REDEEMABLE NONCONTROLLING INTEREST AND SHAREHOLDERS' EQUITY - USD ($) $ in Millions	Total Shareholders' Equity Attributable to Bruker Corporation	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests in Consolidated Subsidiaries	Redeemable Noncontrolling Interest	Total
Balance at beginning of period at Dec. 31, 2018	$ 896.6	$ 1.7	$ (401.5)	$ 176.9	$ 1,102.5	$ 17.0	$ 8.5	$ 22.6	$ 905.1
Balance (in shares) at Dec. 31, 2018		156,609,340	16,024,880
Increase (Decrease) in Stockholders' Equity
Stock options exercised	3.1			3.1					3.1
Stock options exercised (in shares)		167,177
Restricted stock units vested (in shares)		35,072
Stock based compensation	2.7			2.7					2.7
Cash dividends paid to common stockholders ($0.04 per share)	(6.3)				(6.3)				(6.3)
Consolidated net income	30.8				30.8		0.1	(0.2)	30.9
Shares issued for acquisition (in shares)		3,087	(3,087)
Other comprehensive income (loss)	(13.7)					(13.7)	(0.2)	(0.4)	(13.9)
Balance at end of period at Mar. 31, 2019	913.2	$ 1.7	$ (401.5)	182.7	1,127.0	3.3	8.4	22.0	921.6
Balance (in shares) at Mar. 31, 2019		156,814,676	16,021,793
Balance at beginning of period at Dec. 31, 2018	896.6	$ 1.7	$ (401.5)	176.9	1,102.5	17.0	8.5	22.6	905.1
Balance (in shares) at Dec. 31, 2018		156,609,340	16,024,880
Balance at end of period at Sep. 30, 2019	845.2	$ 1.7	$ (543.8)	193.8	1,212.3	(18.8)	9.5	20.9	854.7
Balance (in shares) at Sep. 30, 2019		153,945,784	19,346,577
Balance at beginning of period at Mar. 31, 2019	913.2	$ 1.7	$ (401.5)	182.7	1,127.0	3.3	8.4	22.0	921.6
Balance (in shares) at Mar. 31, 2019		156,814,676	16,021,793
Increase (Decrease) in Stockholders' Equity
Stock options exercised	2.7			2.7					2.7
Stock options exercised (in shares)		145,606
Restricted stock units vested (in shares)		2,344
Stock based compensation	2.6			2.6					2.6
Cash dividends paid to common stockholders ($0.04 per share)	(6.3)				(6.3)				(6.3)
Consolidated net income	36.5				36.5		0.8	(0.3)	37.3
Shares repurchased	(100.0)		$ (100.0)						(100.0)
Shares repurchased (in shares)		(2,300,635)	2,300,635
Other comprehensive income (loss)	12.1					12.1	0.1	0.3	12.2
Balance at end of period at Jun. 30, 2019	860.8	$ 1.7	$ (501.5)	188.0	1,157.2	15.4	9.3	22.0	870.1
Balance (in shares) at Jun. 30, 2019		154,661,991	18,322,428
Increase (Decrease) in Stockholders' Equity
Stock options exercised	3.1			3.1					3.1
Stock options exercised (in shares)		152,918
Restricted stock units vested	(0.8)			(0.8)					(0.8)
Restricted stock units vested (in shares)		155,024
Stock based compensation	3.5			3.5					3.5
Cash dividends paid to common stockholders ($0.04 per share)	(6.2)				(6.2)				(6.2)
Consolidated net income	61.3				61.3		0.4	(0.2)	61.7
Shares repurchased	(42.3)		$ (42.3)						(42.3)
Shares repurchased (in shares)		(1,022,469)	1,022,469
Treasury stock acquired (in shares_		(1,680)	1,680
Other comprehensive income (loss)	(34.2)					(34.2)	(0.2)	(0.9)	(34.4)
Balance at end of period at Sep. 30, 2019	845.2	$ 1.7	$ (543.8)	193.8	1,212.3	(18.8)	9.5	20.9	854.7
Balance (in shares) at Sep. 30, 2019		153,945,784	19,346,577
Balance at beginning of period at Dec. 31, 2019	906.8	$ 1.7	$ (543.8)	199.7	1,274.7	(25.5)	10.3	21.1	917.1
Balance (in shares) at Dec. 31, 2019		154,155,798	19,346,577
Increase (Decrease) in Stockholders' Equity
Stock options exercised	0.7			0.7					0.7
Stock options exercised (in shares)		30,182
Restricted stock units vested	(0.1)			(0.1)					(0.1)
Restricted stock units vested (in shares)		40,516
Stock based compensation	3.0			3.0					3.0
Cash dividends paid to common stockholders ($0.04 per share)	(6.2)				(6.2)		(1.2)		(7.4)
Acquisition of redeemable noncontrolling interest	(1.3)				(1.3)			(20.6)	(1.3)
Consolidated net income	10.5				10.5		0.1		10.6
Other comprehensive income (loss)	2.2					2.2	(0.2)	(0.5)	2.0
Balance at end of period at Mar. 31, 2020	915.6	$ 1.7	$ (543.8)	203.3	1,277.7	(23.3)	9.0		924.6
Balance (in shares) at Mar. 31, 2020		154,226,496	19,346,577
Balance at beginning of period at Dec. 31, 2019	906.8	$ 1.7	$ (543.8)	199.7	1,274.7	(25.5)	10.3	$ 21.1	917.1
Balance (in shares) at Dec. 31, 2019		154,155,798	19,346,577
Balance at end of period at Sep. 30, 2020	952.1	$ 1.7	$ (598.8)	210.7	1,343.7	(5.2)	10.6		962.7
Balance (in shares) at Sep. 30, 2020		153,184,527	20,688,137
Balance at beginning of period at Mar. 31, 2020	915.6	$ 1.7	$ (543.8)	203.3	1,277.7	(23.3)	9.0		924.6
Balance (in shares) at Mar. 31, 2020		154,226,496	19,346,577
Increase (Decrease) in Stockholders' Equity
Stock options exercised	1.3			1.3					1.3
Stock options exercised (in shares)		61,968
Restricted stock units vested	(0.1)			(0.1)					(0.1)
Restricted stock units vested (in shares)		3,510
Stock based compensation	2.8			2.8					2.8
Cash dividends paid to common stockholders ($0.04 per share)	(6.1)				(6.1)				(6.1)
Consolidated net income	24.1				24.1		0.1		24.2
Shares repurchased	(50.0)		$ (50.0)						(50.0)
Shares repurchased (in shares)		(1,214,282)	1,214,282
Other comprehensive income (loss)	9.8					9.8	0.1		9.9
Balance at end of period at Jun. 30, 2020	897.4	$ 1.7	$ (593.8)	207.3	1,295.7	(13.5)	9.2		906.6
Balance (in shares) at Jun. 30, 2020		153,077,692	20,560,859
Increase (Decrease) in Stockholders' Equity
Stock options exercised	0.5			0.5					0.5
Stock options exercised (in shares)		25,461
Restricted stock units vested	(1.2)			(1.2)					(1.2)
Restricted stock units vested (in shares)		208,652
Stock based compensation	4.1			4.1					4.1
Cash dividends paid to common stockholders ($0.04 per share)	(6.3)				(6.3)				(6.3)
Consolidated net income	54.3				54.3		1.0		55.3
Shares repurchased	(5.0)		$ (5.0)						(5.0)
Shares repurchased (in shares)		(127,278)	127,278
Other comprehensive income (loss)	8.3					8.3	0.4		8.7
Balance at end of period at Sep. 30, 2020	$ 952.1	$ 1.7	$ (598.8)	$ 210.7	$ 1,343.7	$ (5.2)	$ 10.6		$ 962.7
Balance (in shares) at Sep. 30, 2020		153,184,527	20,688,137