Quarterly report pursuant to Section 13 or 15(d)

Disposals (Details)

v3.8.0.1
Disposals (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2016
CommerceHub | Disposal Group, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue   $ 7.0 $ 51.0
Disposal Group Net Earnings (Loss)   4.0 4.0
CommerceHub | Spinoff      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue $ 7.0    
Expedia | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Earnings (loss) before income taxes   40.0 15.0
Income tax (expense) benefit   (13.0) (1.0)
Bodybuilding | Disposal Group, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenue   97.0 325.0
Disposal Group Net Earnings (Loss)   $ 2.0 $ 6.0
Liberty Ventures common stock      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share   $ 0.19 $ 0.10
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share   $ 0.19 $ 0.10