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Business Acquisition and Assets and Liabilities Held for Sale (Narrative) (Details)
£ in Millions, $ in Millions
3 Months Ended
Apr. 18, 2019
GBP (£)
Feb. 05, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on disposal of business     $ 119.6 $ 0.0    
Disposal group, not discontinued operations | Gatan, Inc.            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Deferred tax liability, book basis over tax basis           $ 10.0
Thermo Fisher | Disposal group, not discontinued operations | Gatan, Inc.            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Percentage of shares agreed to be sold           100.00%
Sale of business, consideration           $ 925.0
Teledyne | Disposal group, not discontinued operations | Imaging businesses            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Sale of business, consideration         $ 225.0  
Gain on disposal of business   $ 119.6        
Gain on disposal of business, tax expense   $ 30.0        
Foundry | Subsequent Event            
Business Acquisition [Line Items]            
Acquisition consideration | £ £ 410.0          
Percentage of shares acquired 100.00%