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Pension and Other Post-retirement Benefits Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Apr. 30, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 458.5	$ 634.6	$ 652.0	$ 603.1
Equities: | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	23.90%
Equities: | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	33.90%
Defined Benefit Plan Equity Securities Global Low | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	3.40%
Defined Benefit Plan Equity Securities Global Low | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	13.40%
Defined Benefit Plan, Non Equity Securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	19.70%
Defined Benefit Plan, Non Equity Securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	29.70%
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 458.5	634.6	$ 652.0	$ 603.1
Pension Benefits | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	458.5	634.6
Pension Benefits | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	4.9	78.8
Pension Benefits | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	453.6	$ 555.8
Pension Benefits | Equities: | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range		53.00%
Pension Benefits | Equities: | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range		69.00%
Pension Benefits | U.S. large cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range		22.00%
Pension Benefits | U.S. large cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range		28.00%
Pension Benefits | U.S. large cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	99.4	$ 173.7
Pension Benefits | U.S. large cap | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	0.0
Pension Benefits | U.S. large cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	99.4	$ 173.7
Pension Benefits | U.S. small cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range		4.00%
Pension Benefits | U.S. small cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range		10.00%
Pension Benefits | U.S. small cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	25.4	$ 44.7
Pension Benefits | U.S. small cap | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	0.0
Pension Benefits | U.S. small cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	25.4	$ 44.7
Pension Benefits | International all cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range		21.00%
Pension Benefits | International all cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range		29.00%
Pension Benefits | International all cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	50.7	$ 159.1
Pension Benefits | International all cap | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	0.0
Pension Benefits | International all cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	50.7	$ 159.1
Pension Benefits | International small cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range		2.00%
Pension Benefits | International small cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range		8.00%
Pension Benefits | International small cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	22.4	$ 41.7
Pension Benefits | International small cap | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	0.0
Pension Benefits | International small cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	22.4	$ 41.7
Pension Benefits | Emerging markets | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	39.7
Pension Benefits | Emerging markets | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0
Pension Benefits | Emerging markets | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 39.7
Pension Benefits | Real estate equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	0.00%	0.00%
Pension Benefits | Real estate equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	13.00%	13.00%
Pension Benefits | Real estate equities | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 49.0	$ 63.5
Pension Benefits | Real estate equities | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	0.0
Pension Benefits | Real estate equities | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 49.0	$ 63.5
Pension Benefits | Fixed income: | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	25.00%	25.00%
Pension Benefits | Fixed income: | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	35.00%	35.00%
Pension Benefits | Cash and equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets Target Allocation		$ 0.0
Target range		0.00%
Pension Benefits | Cash and equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets Target Allocation		$ 5.0
Target range		10.00%
Pension Benefits | Cash and equivalents | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 4.9	$ 4.5
Pension Benefits | Cash and equivalents | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	4.9	4.5
Pension Benefits | Cash and equivalents | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	$ 0.0
Pension Benefits | Aggregate | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range		9.00%
Pension Benefits | Aggregate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range		19.00%
Pension Benefits | Aggregate | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	45.3	$ 73.1
Pension Benefits | Aggregate | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	0.0
Pension Benefits | Aggregate | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	45.3	$ 73.1
Pension Benefits | Core plus | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range		9.00%
Pension Benefits | Core plus | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range		19.00%
Pension Benefits | Core plus | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	83.7	$ 74.3
Pension Benefits | Core plus | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	74.3
Pension Benefits | Core plus | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	83.7	$ 0.0
Pension Benefits | Defined Benefit Plan Equity Securities Global Low | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	38.0
Pension Benefits | Defined Benefit Plan Equity Securities Global Low | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 38.0

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Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

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