Guarantor Financial Information - Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities			$ (50.2)	$ (39.4)
INVESTING ACTIVITIES
Capital expenditures	$ (9.2)	$ (7.7)	(15.6)	(12.0)
Purchase of investment			0.0	(3.4)
Intercompany note receivable, net			0.0
Other investing activities			0.0	0.2
Net cash used in investing activities			(15.6)	(15.2)
FINANCING ACTIVITIES
Revolving facility borrowings			206.5	174.0
Payments on revolving facility borrowings			(179.5)	(169.0)
Payments on current maturities and long-term debt			0.0	(68.0)
Debt issuance costs			0.0	(1.5)
Separation-related payment from R.R. Donnelley			0.0	68.0
Intercompany note payable, net			0.0
Proceeds from the issuance of common stock			1.2	18.8
Net transfers related to the Separation			0.0	3.0
Net change in short-term debt			0.0	1.0
Intercompany note payable (receivable)				0.0
Treasury stock repurchases			(0.8)	0.0
Other financing activities			0.0
Net cash provided by financing activities			27.4	26.3
Effect of exchange rate on cash and cash equivalents			(1.8)	0.2
Net decrease in cash and cash equivalents			(40.2)	(28.1)
Cash and cash equivalents at beginning of year			52.0	36.2
Cash and cash equivalents at end of period	11.8	8.1	11.8	8.1
Supplemental non-cash disclosure:
Intercompany debt allocation			0.0
Eliminations
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities			0.0	(15.1)
INVESTING ACTIVITIES
Capital expenditures			0.0	0.0
Purchase of investment				0.0
Intercompany note receivable, net			(11.5)
Other investing activities			0.6	0.0
Net cash used in investing activities			(10.9)	0.0
FINANCING ACTIVITIES
Revolving facility borrowings			0.0	0.0
Payments on revolving facility borrowings			0.0	0.0
Payments on current maturities and long-term debt				0.0
Debt issuance costs				0.0
Separation-related payment from R.R. Donnelley				0.0
Intercompany note payable, net			11.5
Proceeds from the issuance of common stock			0.0	0.0
Net transfers related to the Separation				0.0
Net change in short-term debt				0.0
Intercompany note payable (receivable)				0.0
Treasury stock repurchases			0.0
Other financing activities			(0.6)
Net cash provided by financing activities			10.9	0.0
Effect of exchange rate on cash and cash equivalents			0.0	0.0
Net decrease in cash and cash equivalents			0.0	(15.1)
Cash and cash equivalents at beginning of year			0.0	(2.4)
Cash and cash equivalents at end of period	0.0	(17.5)	0.0	(17.5)
Supplemental non-cash disclosure:
Intercompany debt allocation			0.0
Parent
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities			(24.2)	(35.5)
INVESTING ACTIVITIES
Capital expenditures			0.0	0.0
Purchase of investment				0.0
Intercompany note receivable, net			0.0
Other investing activities			0.0	0.0
Net cash used in investing activities			0.0	0.0
FINANCING ACTIVITIES
Revolving facility borrowings			206.5	174.0
Payments on revolving facility borrowings			(179.5)	(169.0)
Payments on current maturities and long-term debt				(68.0)
Debt issuance costs				(1.5)
Separation-related payment from R.R. Donnelley				68.0
Intercompany note payable, net			(11.5)
Proceeds from the issuance of common stock			1.2	18.8
Net transfers related to the Separation				3.0
Net change in short-term debt				1.0
Intercompany note payable (receivable)				9.2
Treasury stock repurchases			(0.8)
Other financing activities			0.0
Net cash provided by financing activities			15.9	35.5
Effect of exchange rate on cash and cash equivalents			0.0	0.0
Net decrease in cash and cash equivalents			(8.3)	0.0
Cash and cash equivalents at beginning of year			8.3	0.0
Cash and cash equivalents at end of period	0.0	0.0	0.0	0.0
Supplemental non-cash disclosure:
Intercompany debt allocation			(376.0)
Guarantor Subsidiaries
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities			(10.3)	12.4
INVESTING ACTIVITIES
Capital expenditures			(14.7)	(11.3)
Purchase of investment				(3.4)
Intercompany note receivable, net			0.0
Other investing activities			(0.6)	0.2
Net cash used in investing activities			(15.3)	(14.5)
FINANCING ACTIVITIES
Revolving facility borrowings			0.0	0.0
Payments on revolving facility borrowings			0.0	0.0
Payments on current maturities and long-term debt				0.0
Debt issuance costs				0.0
Separation-related payment from R.R. Donnelley				0.0
Intercompany note payable, net			0.0
Proceeds from the issuance of common stock			0.0	0.0
Net transfers related to the Separation				0.0
Net change in short-term debt				0.0
Intercompany note payable (receivable)				0.0
Treasury stock repurchases			0.0
Other financing activities			0.0
Net cash provided by financing activities			0.0	0.0
Effect of exchange rate on cash and cash equivalents			0.0	0.0
Net decrease in cash and cash equivalents			(25.6)	(2.1)
Cash and cash equivalents at beginning of year			27.9	21.8
Cash and cash equivalents at end of period	2.3	19.7	2.3	19.7
Supplemental non-cash disclosure:
Intercompany debt allocation			376.0
Non-guarantor Subsidiaries
OPERATING ACTIVITIES
Net cash (used in) provided by operating activities			(15.7)	(1.2)
INVESTING ACTIVITIES
Capital expenditures			(0.9)	(0.7)
Purchase of investment				0.0
Intercompany note receivable, net			11.5
Other investing activities			0.0	0.0
Net cash used in investing activities			10.6	(0.7)
FINANCING ACTIVITIES
Revolving facility borrowings			0.0	0.0
Payments on revolving facility borrowings			0.0	0.0
Payments on current maturities and long-term debt				0.0
Debt issuance costs				0.0
Separation-related payment from R.R. Donnelley				0.0
Intercompany note payable, net			0.0
Proceeds from the issuance of common stock			0.0	0.0
Net transfers related to the Separation				0.0
Net change in short-term debt				0.0
Intercompany note payable (receivable)				(9.2)
Treasury stock repurchases			0.0
Other financing activities			0.6
Net cash provided by financing activities			0.6	(9.2)
Effect of exchange rate on cash and cash equivalents			(1.8)	0.2
Net decrease in cash and cash equivalents			(6.3)	(10.9)
Cash and cash equivalents at beginning of year			15.8	16.8
Cash and cash equivalents at end of period	$ 9.5	$ 5.9	9.5	$ 5.9
Supplemental non-cash disclosure:
Intercompany debt allocation			$ 0.0