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Pension and Other Post-retirement Benefits Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Apr. 11, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 603.1	$ 598.9	$ 576.8
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	603.1	598.9	$ 576.8
Pension Benefits | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	603.1	598.9
Pension Benefits | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	79.8	84.1
Pension Benefits | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 523.3	$ 514.8
Pension Benefits | Equities: | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	53.00%	53.00%
Pension Benefits | Equities: | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	69.00%	69.00%
Pension Benefits | U.S. large cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	22.00%	22.00%
Pension Benefits | U.S. large cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	28.00%	28.00%
Pension Benefits | U.S. large cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 151.9	$ 148.9
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	$ 151.9	$ 148.9
Pension Benefits | U.S. small cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	4.00%	4.00%
Pension Benefits | U.S. small cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	10.00%	10.00%
Pension Benefits | U.S. small cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 48.1	$ 41.1
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	$ 48.1	$ 41.1
Pension Benefits | International all cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	21.00%	21.00%
Pension Benefits | International all cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	29.00%	29.00%
Pension Benefits | International all cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 158.5	$ 152.4
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	$ 158.5	$ 152.4
Pension Benefits | International small cap | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	2.00%	2.00%
Pension Benefits | International small cap | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	8.00%	8.00%
Pension Benefits | International small cap | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 37.0	$ 34.7
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	$ 37.0	$ 34.7
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	$ 53.5	$ 54.9
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	$ 53.5	$ 54.9
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]
Target range	0.00%	0.00%
Pension Benefits | Cash and equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	10.00%	10.00%
Pension Benefits | Cash and equivalents | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 4.0	$ 6.5
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	4.0	6.5
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%	9.00%
Pension Benefits | Aggregate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	19.00%	19.00%
Pension Benefits | Aggregate | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 74.3	$ 76.7
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	$ 74.3	$ 76.7
Pension Benefits | Core plus | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	9.00%	9.00%
Pension Benefits | Core plus | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	19.00%	19.00%
Pension Benefits | Core plus | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 75.8	$ 77.6
Pension Benefits | Core plus | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	75.8	77.6
Pension Benefits | Core plus | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets		0.0
Pension Benefits | Group annuity contracts | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	0.0	6.1
Pension Benefits | Group annuity contracts | 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 | Group annuity contracts | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 0.0	$ 6.1

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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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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