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Acquisitions - Anasys (Details) - USD ($) $ in Millions				6 Months Ended
Acquisitions - Anasys (Details) - USD ($) $ in Millions	Apr. 08, 2019	Apr. 02, 2019	Apr. 08, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Acquisitions
Purchase price				$ 71.9	$ 37.6
Allocation of Consideration Transferred:
Goodwill				$ 284.7		$ 275.7
Anasys Instruments Corp
Acquisitions
Ownership percentage acquired			100.00%
Purchase price			$ 27.0
Maximum additional consideration			9.6
Contingent consideration	$ 5.3		5.3
Amortization period for intangible assets acquired		8 years
Consideration Transferred:
Cash paid			27.0
Contingent consideration	$ 5.3		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
Acquisitions
Amortization period for intangible assets acquired		1 year
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