Discontinued Operations - Reconciliation of Financial Position (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total current assets of discontinued operations	$ 0.0	$ 21.8
Total noncurrent assets of discontinued operations	0.0	241.9
Total current liabilities of discontinued operations	0.0	31.9
Total noncurrent liabilities of discontinued operations	$ 0.0	150.1
OneDigital | Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and cash equivalents		4.7
Trade receivables		13.6
Prepaid expenses and other current assets		3.5
Total current assets of discontinued operations		21.8
Property and equipment, net		3.0
Deferred tax assets		17.0
Other intangible assets, net		115.6
Goodwill		104.7
Other long term investments and noncurrent assets		1.6
Total noncurrent assets of discontinued operations		241.9
Total assets of discontinued operations		263.7
Accounts payable and other accrued liabilities, current		28.5
Income taxes payable		3.4
Total current liabilities of discontinued operations		31.9
Long term notes payable		128.7
Accounts payable and other accrued liabilities, noncurrent		21.4
Total noncurrent liabilities of discontinued operations		150.1
Total liabilities of discontinued operations		$ 182.0