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Acquisitions - Anasys and JPK (Details) € in Millions, $ in Millions				9 Months Ended
	Jul. 11, 2018 USD ($)	Jul. 11, 2018 EUR (€)	Apr. 08, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Acquisitions
Purchase price				$ 79.0	$ 55.3
Allocation of Consideration Transferred:
Goodwill				$ 282.3		$ 275.7
Anasys Instruments Corp
Acquisitions
Ownership percentage acquired			100.00%
Purchase price			$ 27.0
Maximum additional consideration			9.6
Contingent consideration			5.3
Consideration Transferred:
Cash paid			27.0
Contingent consideration			5.3
Total consideration transferred			32.3
Allocation of Consideration Transferred:
Inventories			2.8
Accounts receivable			0.8
Other current and non-current assets			1.1
Goodwill			16.6
Deferred taxes, net			(3.2)
Liabilities assumed			(3.5)
Total consideration allocated			$ 32.3
Amortization period for intangible assets acquired			8 years
Anasys Instruments Corp \| Customer relationships
Allocation of Consideration Transferred:
Intangible assets			$ 8.0
Anasys Instruments Corp \| Technology
Allocation of Consideration Transferred:
Intangible assets			7.3
Anasys Instruments Corp \| Backlog
Allocation of Consideration Transferred:
Intangible assets			$ 1.8
Amortization period for intangible assets acquired			1 year
Anasys Instruments Corp \| Trade names
Allocation of Consideration Transferred:
Intangible assets			$ 0.6
JPK Instruments AG
Acquisitions
Ownership percentage acquired	100.00%
Purchase price	$ 16.6	€ 14.2
Maximum additional consideration	5.0	€ 4.3
Contingent consideration	4.3
Consideration Transferred:
Cash paid	16.6
Cash acquired	(0.2)
Contingent consideration	4.3
Total consideration transferred	20.7
Allocation of Consideration Transferred:
Inventories	3.0
Accounts receivable	1.8
Other current and non-current assets	0.7
Goodwill	8.0
Deferred taxes, net	(4.9)
Liabilities assumed	(4.1)
Total consideration allocated	$ 20.7
Amortization period for intangible assets acquired	8 years	8 years
JPK Instruments AG \| Customer relationships
Allocation of Consideration Transferred:
Intangible assets	$ 7.5
JPK Instruments AG \| Technology
Allocation of Consideration Transferred:
Intangible assets	7.0
JPK Instruments AG \| Backlog
Allocation of Consideration Transferred:
Intangible assets	$ 1.1
Amortization period for intangible assets acquired	1 year	1 year
JPK Instruments AG \| Trade names
Allocation of Consideration Transferred:
Intangible assets	$ 0.6