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Pension and Other Post-retirement Benefits Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Apr. 11, 2019
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 598.9	$ 576.8
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	598.9	$ 576.8
Pension Benefits | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	598.9
Pension Benefits | Quoted prices in active markets for identical assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	84.1
Pension Benefits | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 514.8
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	$ 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
Pension Benefits | U.S. large cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 148.9
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	$ 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
Pension Benefits | U.S. small cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 41.1
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	$ 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
Pension Benefits | International all cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 152.4
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	$ 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
Pension Benefits | International small cap | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 34.7
Pension Benefits | Real estate equities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	0.00%
Pension Benefits | Real estate equities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	13.00%
Pension Benefits | Real estate equities | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 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
Pension Benefits | Real estate equities | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 54.9
Pension Benefits | Fixed income: | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	25.00%
Pension Benefits | Fixed income: | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	35.00%
Pension Benefits | Cash and equivalents | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target range	0.00%
Pension Benefits | Cash and equivalents | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target range	10.00%
Pension Benefits | Cash and equivalents | Total
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 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	6.5
Pension Benefits | Cash and equivalents | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 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	$ 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
Pension Benefits | Aggregate | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 76.7
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	$ 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	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	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
Pension Benefits | Group annuity contracts | Significant observable inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assets	$ 6.1

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