Acquisitions Schedule of Business Combinations (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 19, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill		$ 1,035.2	$ 113.2
Payments to acquire businesses, net of cash acquired		1,556.6	190.1	$ 37.1
Acquisitions, 2017 [Member]
Business Acquisition [Line Items]
Accounts receivable		103.7
Inventories		37.3
Property, plant and equipment		137.1
Goodwill		1,035.2
Other intangible assets, primarily customer relationships, trade names and technology		587.8
Trade accounts payable		(18.7)
Other assets and liabilities, net		(289.0)
Previously held investment		(36.8)
Payments to acquire businesses, net of cash acquired		1,556.6
Acquisitions, 2016 [Member]
Business Acquisition [Line Items]
Accounts receivable			5.2
Inventories			2.2
Property, plant and equipment			0.6
Goodwill			113.2
Other intangible assets, primarily customer relationships, trade names and technology			82.7
Trade accounts payable			(1.5)
Other assets and liabilities, net			(12.3)
Previously held investment			0.0
Payments to acquire businesses, net of cash acquired			$ 190.1
Acquisitions, 2015 [Member]
Business Acquisition [Line Items]
Accounts receivable				2.8
Inventories				3.1
Property, plant and equipment				1.0
Goodwill				21.2
Other intangible assets, primarily customer relationships, trade names and technology				13.0
Trade accounts payable				(0.9)
Other assets and liabilities, net				(3.1)
Previously held investment				0.0
Payments to acquire businesses, net of cash acquired				$ 37.1
Acquisitions, Landauer [Member]
Business Acquisition [Line Items]
Accounts receivable		31.2
Inventories		5.0
Property, plant and equipment		23.1
Goodwill		514.4
Other intangible assets, primarily customer relationships, trade names and technology		293.0
Trade accounts payable		(3.1)
Other assets and liabilities, net		(106.9)
Previously held investment		0.0
Payments to acquire businesses, net of cash acquired	$ 760.0	756.7
Others
Business Acquisition [Line Items]
Accounts receivable		72.5
Inventories		32.3
Property, plant and equipment		114.0
Goodwill		520.8
Other intangible assets, primarily customer relationships, trade names and technology		294.8
Trade accounts payable		(15.6)
Other assets and liabilities, net		(182.1)
Previously held investment		(36.8)
Payments to acquire businesses, net of cash acquired		$ 799.9