Statement of Consolidated Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net Loss	$ (109.1)	$ (53.5)	$ (104.0)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax [Abstract]
Net actuarial gains (losses)	(112.7)	204.6	(51.7)
Settlement adjustments	64.7	2.7	1.8
Amortization of prior net losses	12.1	12.7	12.9
Amortization of prior net service credit	(0.4)	(0.4)	(0.4)
Changes in foreign currency translation	0.5	0.9	0.4
Other comprehensive income (loss)	(35.8)	220.5	(37.0)
Comprehensive Income (Loss)	$ (144.9)	$ 167.0	$ (141.0)

Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income. Excludes changes in equity resulting from investments by owners and distributions to owners.

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- References

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