Discontinued Operations - Disposal Group Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and cash equivalents	$ 0.0	$ 4.0	$ 10.1
Customer Communications | Discontinued Operations, Held-for-sale
Assets
Cash and cash equivalents		4.0
Accounts receivable		38.9
Unconsolidated affiliates		0.2
Properties, net		9.9
Intangible assets, net		11.2
Other assets		8.4
Total assets held for sale	$ 0.0	72.6	$ 295.2
Liabilities
Current portion of debt		0.4
Accounts payable		13.2
Accrued compensation and benefits		3.8
Deferred revenues and gains		0.8
Long-term debt		1.7
Income tax payable		1.0
Other liabilities		9.2
Total liabilities held for sale		$ 30.1