Stockholders' Deficit (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity Note [Abstract]

Schedule of Activity of Company's Authorized Issued and Outstanding

The following table is a summary of the Company's authorized, issued and outstanding stock as of December 31, 2020:

	D Stock			Common Stock			Treasury Stock
	Authorized	Issued	Outstanding	Authorized	Issued	Outstanding
January 1, 2018	200,000	71,282	(71,282)	162,500,000	58,823,567	(54,238,344)	4,585,223
Release for restricted stock units and stock options exercised	—	—	—	—	—	(1,378,105)	(1,378,105)
December 31, 2018	200,000	71,282	(71,282)	162,500,000	58,823,567	(55,616,449)	3,207,118
Release for restricted stock units	—	—	—	—	—	(877,212)	(877,212)
Shares issued to Ripple as part of SPA(1)	—	—	—	—	6,237,523	(6,237,523)	—
December 31, 2019	200,000	71,282	(71,282)	162,500,000	65,061,090	(62,731,184)	2,329,906
Release for restricted stock units	—	—	—	—	56,358	(876,121)	(819,763)
Preferred stock - series D conversion	—	(71,282)	71,282	—	7,413,322	(8,910,234)	(1,496,912)
December 31, 2020	200,000	—	—	162,500,000	72,530,770	(72,517,539)	13,231

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table details the components of "Accumulated other comprehensive loss" as of December 31:

(Amounts in millions)	2020		2019
Net unrealized gains on securities classified as available-for-sale, net of tax	$	1.2	$	1.6
Cumulative non-U.S. dollar translation adjustments, net of tax	(20.9)		(28.1)
Pension and postretirement benefits adjustments, net of tax	(38.7)		(37.0)
Accumulated other comprehensive loss	$	(58.4)	$	(63.5)

Summary of Significant Amounts Reclassified

The following table is a summary of the significant amounts reclassified out of each component of "Accumulated other comprehensive loss" during the years ended December 31:

(Amounts in millions)	2020		2019		2018		Statement of Operations Location
Pension and postretirement benefits adjustments:
Amortization of prior service credit	$	0.1	$	0.1	$	0.1	"Other non-operating expense (income)"
Amortization of net actuarial loss	2.1		2.7		4.4		"Other non-operating expense (income)"
Settlement charge	—		31.3		—		"Other non-operating expense (income)"
Total before tax	2.2		34.1		4.5
Tax benefit, net	(0.5)		(7.9)		(1.0)
Total, net of tax	$	1.7	$	26.2	$	3.5

Summary of Changes to Accumulated Other Comprehensive Loss By Component

The following table is a summary of the changes to Accumulated other comprehensive loss by component:

(Amounts in millions)	Net Unrealized Gains on Securities Classified as Available-for-sale, Net of Tax		Cumulative non-U.S. dollar Translation Adjustments, Net of Tax		Pension and Postretirement Benefits Adjustment, Net of Tax		Total
January 1, 2018	$	2.2	$	(10.4)	$	(54.8)	$	(63.0)
Other comprehensive (loss) income before reclassification	(0.3)		(13.8)		6.1		(8.0)
Amounts reclassified from accumulated other comprehensive loss	—		—		3.5		3.5
Net current year other comprehensive (loss) income	(0.3)		(13.8)		9.6		(4.5)
December 31, 2018	1.9		(24.2)		(45.2)		(67.5)
Cumulative effect of adoption of ASU 2018-02	—		(3.7)		(11.4)		(15.1)
Other comprehensive loss before reclassification	(0.3)		(0.2)		(6.6)		(7.1)
Amounts reclassified from accumulated other comprehensive loss	—		—		26.2		26.2
Net current year other comprehensive (loss) income	(0.3)		(0.2)		19.6		19.1
December 31, 2019	1.6		(28.1)		(37.0)		(63.5)
Other comprehensive (loss) income before reclassification	(0.4)		7.2		(3.4)		3.4
Amounts reclassified from accumulated other comprehensive loss	—		—		1.7		1.7
Net current year other comprehensive (loss) income	(0.4)		7.2		(1.7)		5.1
December 31, 2020	$	1.2	$	(20.9)	$	(38.7)	$	(58.4)