Condensed Consolidated Statements of Stockholder Equity - USD ($)		Total		Total stockholder equity	Common stock	Capital surplus	(Accumulated deficit) Retained earnings	Treasury stock	Cumulative translation adjustment	Defined benefit postretirement plans	Cash flow hedging derivative	Non-controlling interest
Pension adjustments, tax benefit (expense)		$ 100,000
Change in cumulative translation adjustment, tax expense (benefit)		3,000,000
Derivative financial instrument, tax expense (benefit)		300,000
Balance at beginning of period at Dec. 31, 2020		3,583,900,000		$ 3,525,600,000	$ 0	$ 4,310,200,000	$ (690,100,000)	$ 0	$ 26,200,000	$ (120,300,000)	$ (400,000)	$ 58,300,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(74,100,000)		(76,700,000)			(76,700,000)					2,600,000
Shares issued for Bisnode acquisition		158,900,000		158,900,000		158,900,000
Equity-based compensation plans		13,000,000.0		13,000,000.0		13,300,000		(300,000)
Pension adjustments, net of tax expense (benefit)		800,000		800,000						800,000
Change in cumulative translation adjustment, net of tax expense (benefit)		(32,900,000)	[1]	(34,500,000)					(34,500,000)			1,600,000
Net investment hedge derivative, net of tax expense	[2]	0
Derivative financial instruments, net of tax expense (benefit)		800,000	[3]	800,000							800,000
Payment to non-controlling interest		(1,800,000)										(1,800,000)
Balance at end of period at Jun. 30, 2021		3,648,600,000		3,587,900,000	0	4,482,400,000	(766,800,000)	(300,000)	(8,300,000)	(119,500,000)	400,000	60,700,000
Pension adjustments, tax benefit (expense)		100,000
Change in cumulative translation adjustment, tax expense (benefit)		1,900,000
Derivative financial instrument, tax expense (benefit)		400,000
Balance at beginning of period at Mar. 31, 2021		3,678,200,000		3,617,600,000	0	4,475,300,000	(715,100,000)	(300,000)	(23,800,000)	(119,900,000)	1,400,000	60,600,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(50,800,000)		(51,700,000)			(51,700,000)					900,000
Equity-based compensation plans		7,100,000		7,100,000		7,100,000
Pension adjustments, net of tax expense (benefit)		400,000		400,000						400,000
Change in cumulative translation adjustment, net of tax expense (benefit)		16,400,000	[1]	15,500,000					15,500,000			900,000
Net investment hedge derivative, net of tax expense	[2]	0
Derivative financial instruments, net of tax expense (benefit)		(1,000,000.0)	[3]	(1,000,000.0)							(1,000,000.0)
Payment to non-controlling interest		(1,700,000)										(1,700,000)
Balance at end of period at Jun. 30, 2021		3,648,600,000		3,587,900,000	0	4,482,400,000	(766,800,000)	(300,000)	(8,300,000)	(119,500,000)	400,000	60,700,000
Pension adjustments, tax benefit (expense)		(100,000)
Change in cumulative translation adjustment, tax expense (benefit)		(2,900,000)
Investment hedge, tax expense (benefit)		2,000,000.0
Derivative financial instrument, tax expense (benefit)		11,400,000
Balance at beginning of period at Dec. 31, 2021		3,745,300,000		3,681,200,000	0	4,500,400,000	(761,800,000)	(300,000)	(52,600,000)	(11,900,000)	7,400,000	64,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(29,800,000)		(33,100,000)			(33,100,000)					3,300,000
Equity-based compensation plans		21,200,000		21,200,000		21,200,000		0
Pension adjustments, net of tax expense (benefit)		(200,000)		(200,000)						(200,000)
Change in cumulative translation adjustment, net of tax expense (benefit)		(126,900,000)	[1]	(123,400,000)					(123,400,000)			(3,500,000)
Net investment hedge derivative, net of tax expense		5,500,000	[2]	5,500,000					5,500,000
Derivative financial instruments, net of tax expense (benefit)		30,900,000	[3]	30,900,000							30,900,000
Payment to non-controlling interest		(300,000)										(300,000)
Balance at end of period at Jun. 30, 2022		3,645,700,000		3,582,100,000	0	4,521,600,000	(794,900,000)	(300,000)	(170,500,000)	(12,100,000)	38,300,000	63,600,000
Pension adjustments, tax benefit (expense)		100,000
Change in cumulative translation adjustment, tax expense (benefit)		(2,000,000.0)
Investment hedge, tax expense (benefit)		2,000,000.0
Derivative financial instrument, tax expense (benefit)		2,700,000
Balance at beginning of period at Mar. 31, 2022		3,708,900,000		3,643,500,000	0	4,506,800,000	(793,100,000)	(300,000)	(88,900,000)	(12,000,000.0)	31,000,000.0	65,400,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		0		(1,800,000)			(1,800,000)					1,800,000
Equity-based compensation plans		14,800,000		14,800,000		14,800,000		0
Pension adjustments, net of tax expense (benefit)		(100,000)		(100,000)						(100,000)
Change in cumulative translation adjustment, net of tax expense (benefit)		(90,600,000)	[1]	(87,100,000)					(87,100,000)			(3,500,000)
Net investment hedge derivative, net of tax expense		5,500,000	[2]	5,500,000					5,500,000
Derivative financial instruments, net of tax expense (benefit)		7,300,000	[3]	7,300,000							7,300,000
Payment to non-controlling interest		(100,000)										(100,000)
Balance at end of period at Jun. 30, 2022		$ 3,645,700,000		$ 3,582,100,000	$ 0	$ 4,521,600,000	$ (794,900,000)	$ (300,000)	$ (170,500,000)	$ (12,100,000)	$ 38,300,000	$ 63,600,000

[1] Tax Expense (Benefit) of $(2.0) million and $1.9 million for the three months ended June 30, 2022 and 2021, respectively. Tax Expense (Benefit) of $(2.9) million and $3.0 million for the six months ended June 30, 2022 and 2021, respectively.(2)Tax Expense (Benefit) of $2.0 million for the three months ended June 30, 2022. Tax Expense (Benefit) of $2.0 million for the six months ended June 30, 2022.

[2] Tax Expense (Benefit) of $2.0 million for the three months ended June 30, 2022. Tax Expense (Benefit) of $2.0 million for the six months ended June 30, 2022.

[3] Tax Expense (Benefit) of $2.7 million and $0.4 million for the three months ended June 30, 2022 and 2021, respectively. Tax Expense (Benefit) of $11.4 million and $0.3 million for the six months ended June 30, 2022 and 2021, respectively.