Summary of Significant Accounting Policies Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (14.4)	$ (26.3)	$ (24.8)	$ (32.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		0.6
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.9	0.4
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax		(0.7)		(1.3)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		0.6
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0.0
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	(15.6)	(28.0)	(26.1)	(34.1)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1.0	1.3
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member]
Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax	1.2	2.4	$ 1.3	$ 3.3
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0.0	0.0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.1)	(0.9)
Settlement Cost [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9.5	4.8
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax		0.0
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Pension Plan [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9.5	4.8
Settlement Cost [Member] | Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member] | Other Postretirement Benefits Plan [Member]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 0.0	$ 0.0