Equity (Tables) - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2023

Dec. 31, 2022

Dec. 31, 2021

Accumulated Other Comprehensive Income (Loss) [Line Items]

Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

Accumulated Other Comprehensive Loss, net of tax, is summarized by component as follows:

	December 31, 2023		December 31, 2022
Pension(1)	(18.7)		(95.4)
SERP/ Retiree medical	6.8		12.7
Derivatives - foreign currency hedge	2.2		(7.1)
Foreign currency impact on long term intercompany loan	(14.6)		(16.4)
Currency translation adjustment	(65.3)		(97.7)
Total accumulated other comprehensive loss	$	(89.6)	$	(203.9)

Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax

$ (57.3)

$ (107.0)

$ 2.1

Accumulated Other Comprehensive Income (Loss)

$ (89.6)

(203.9)

Schedule Of Earnings Per Share, Basic And Diluted

Earnings per Share Calculation

Basic net income per share is computed using the weighted-average number of outstanding shares of Common Stock during the measurement period. Diluted net income per share is computed using the weighted-average number of outstanding shares of Common Stock and, when dilutive, potential outstanding shares of Common Stock during the measurement period.

The following table sets forth the computation of basic and diluted earnings per share:

	For the Twelve Months Ended
	December 31, 2023					December 31, 2022					December 31, 2021
	Loss		Shares	Per Share Amount		Loss		Shares	Per Share Amount		Loss		Shares	Per Share Amount
Basic EPS
Loss available to common shareholders	$	(616.2)	106.6	$	(5.78)	$	(545.7)	104.6	$	(5.21)	$	(540.8)	104.2	$	(5.19)
Income allocated to participating securities	—		—			—		—			—		—
Net loss	$	(616.2)				$	(545.7)				$	(540.8)
Diluted potential common shares
Diluted EPS
Net loss	$	(616.2)	106.6	$	(5.78)	$	(545.7)	104.6	$	(5.21)	$	(540.8)	104.2	$	(5.19)

Included in the outstanding common shares were 0.1 million, 0.4 million and 0.7 million of issued but unvested shares at December 31, 2023, 2022 and 2021, respectively, which are excluded from the basic EPS calculation.

Common shares of 2.0 million were excluded from diluted EPS as a result of incurring a net loss for the twelve-month period ended December 31, 2023, as the effect would have been antidilutive. Additionally, diluted EPS for the twelve-month period ended December 31, 2023 excludes 0.1 million shares that may be dilutive common shares in the future, but were not included in the computation of diluted EPS because the effect was either antidilutive or the performance condition was not met.

Common shares of 0.6 million were excluded from diluted EPS as a result of incurring a net loss for the twelve-month period ended December 31, 2022, as the effect would have been antidilutive. Additionally, diluted EPS for the twelve-month period ended December 31, 2022 excluded 0.3 million shares that were not included in the computation of diluted EPS because the effect was either antidilutive or the performance condition was not met.

Accumulated Defined Benefit Plans Adjustment [Member]

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Income (Loss)

$ (18.7)

(95.4)

Accumulated SERP And Retiree Medical [Member]

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Income (Loss)

6.8

12.7

Foreign Currency Impact On Long Term Intercompany Loan [Member]

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Income (Loss)

(14.6)

(16.4)

Accumulated Translation Adjustment [Member]

Accumulated Other Comprehensive Income (Loss) [Line Items]

Accumulated Other Comprehensive Income (Loss)

$ (65.3)

$ (97.7)