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Acquisitions, Discontinued Operations, and Other Dispositions - Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		7 Months Ended	12 Months Ended
	Jun. 07, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Business acquisition and other investments, net of cash acquired					$ 180.8	$ 0.0	$ 0.0
Goodwill				$ 394.4	394.4	345.9	340.4
Net loss incurred					(81.2)	(89.3)	$ 67.2
Cues, Inc.
Business Acquisition [Line Items]
Business acquisition and other investments, net of cash acquired	$ 164.4	$ 164.4
Cash acquired	20.6	$ 20.6
Current assets, including cash and equivalents of $20.6	70.4
Cash and cash equivalents	20.6
Property, plant and equipment	7.4
Goodwill	48.6
Intangible assets	79.5
Other assets	2.3
Total assets acquired	208.2
Current liabilities assumed	7.8
Non-current liabilities assumed	15.4
Net assets acquired	185.0
Gross receivables acquired	13.6
Fair value of gross receivables acquired	13.2
Revenues and net losses				52.3
Net loss incurred				0.4
Charges associated with the excess fair value over historical cost of inventory acquired				$ 4.3
Business Acquisition, Pro Forma Information [Abstract]
Revenues					1,572.7	1,511.4
Income from continuing operations					87.1	87.4
Net income					$ 90.1	$ 92.7
Income from continuing operations per share - Basic (usd per share)					$ 2.02	$ 2.06
Income from continuing operations per share - Diluted (usd per share)					1.95	1.99
Net income per share - Basic (usd per share)					2.09	2.19
Net income per share - Diluted (usd per share)					$ 2.02	$ 2.11
Schonstedt Instrument Company
Business Acquisition [Line Items]
Business acquisition and other investments, net of cash acquired			$ 16.4
Cash acquired			$ 0.3
Trademarks | Cues, Inc.
Business Acquisition [Line Items]
Intangible assets	27.6
Order or Production Backlog | Cues, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 0.8
Finite-lived intangible assets amortization period (in years)	6 months
Customer relationships | Cues, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 42.6
Finite-lived intangible assets amortization period (in years)	12 years
Technology | Cues, Inc.
Business Acquisition [Line Items]
Intangible assets	$ 8.5
Finite-lived intangible assets amortization period (in years)	11 years
Selling, General and Administrative Expenses | Cues, Inc.
Business Acquisition [Line Items]
Acquisition related costs					$ 2.4

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