Segment Information - Schedule of Segment Reporting Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net Sales	$ 1,191.3	$ 1,417.2	$ 3,417.7	$ 4,044.0
Income (Loss) from Operations	15.9	71.0	30.0	106.4
Depreciation and amortization	36.2	42.0	112.3	121.5
Capital Expenditures			54.4	107.4
Assets of Operations	3,427.9		3,427.9		$ 3,330.1
Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	36.2	42.0	112.3	121.5
Capital Expenditures	16.3	31.0	54.4	107.4
Assets of Operations	3,427.9		3,427.9		3,330.1
Total Operating Segments
Segment Reporting Information [Line Items]
Net Sales	1,211.7	1,449.3	3,475.8	4,127.8
Income (Loss) from Operations	79.4	101.9	157.3	179.5
Total Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	34.9	39.5	109.3	115.6
Capital Expenditures	12.8	25.7	39.0	92.0
Assets of Operations	2,957.2		2,957.2		3,077.0
Intersegment Sales
Segment Reporting Information [Line Items]
Net Sales	(20.4)	(32.1)	(58.1)	(83.8)
Corporate
Segment Reporting Information [Line Items]
Income (Loss) from Operations	(63.5)	(30.9)	(127.3)	(73.1)
Corporate | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	1.3	2.5	3.0	5.9
Capital Expenditures	3.5	5.3	15.4	15.4
Assets of Operations	470.7		470.7		253.1
Business Services
Segment Reporting Information [Line Items]
Net Sales	936.8	1,073.8	2,625.4	3,137.5
Business Services | Total Operating Segments
Segment Reporting Information [Line Items]
Net Sales	953.0	1,097.3	2,667.4	3,196.9
Income (Loss) from Operations	69.1	77.5	123.9	140.6
Business Services | Total Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	23.5	24.8	71.7	77.4
Capital Expenditures	10.2	17.7	30.0	60.4
Assets of Operations	2,308.1		2,308.1		2,328.9
Business Services | Intersegment Sales
Segment Reporting Information [Line Items]
Net Sales	(16.2)	(23.5)	(42.0)	(59.4)
Marketing Solutions
Segment Reporting Information [Line Items]
Net Sales	254.5	343.4	792.3	906.5
Marketing Solutions | Total Operating Segments
Segment Reporting Information [Line Items]
Net Sales	258.7	352.0	808.4	930.9
Income (Loss) from Operations	10.3	24.4	33.4	38.9
Marketing Solutions | Total Operating Segments | Continuing Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	11.4	14.7	37.6	38.2
Capital Expenditures	2.6	8.0	9.0	31.6
Assets of Operations	649.1		649.1		$ 748.1
Marketing Solutions | Intersegment Sales
Segment Reporting Information [Line Items]
Net Sales	$ (4.2)	$ (8.6)	$ (16.1)	$ (24.4)