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Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets $ 568.6 $ 745.7 $ 759.4
Pension [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 134.3 12.2  
Pension [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 411.9 711.9  
Pension [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 22.4 21.6  
Pension [Member] | U.S. Large-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 61.2 [1] 113.8 [2]  
Pension [Member] | U.S. Large-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Large-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 61.2 [1] 113.8 [2]  
Pension [Member] | U.S. Large-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 40.0 [1] 47.6 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 40.0 [1] 47.6 [2]  
Pension [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Small-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 35.4 [1] 46.2 [2]  
Pension [Member] | U.S. Small-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | U.S. Small-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 35.4 [1] 46.2 [2]  
Pension [Member] | U.S. Small-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | International [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 127.0 158.2  
Pension [Member] | International [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 127.0 0.0  
Pension [Member] | International [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 158.2  
Pension [Member] | International [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Fixed Income [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 275.3 [1] 346.1 [2]  
Pension [Member] | Fixed Income [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | Fixed Income [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 275.3 [1] 346.1 [2]  
Pension [Member] | Fixed Income [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [1] 0.0 [2]  
Pension [Member] | Cash and Cash Equivalents [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 7.3 12.2  
Pension [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 7.3 12.2  
Pension [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Private Equity [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   0.0 7.0
Pension [Member] | Real Estate [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 22.4 21.6  
Pension [Member] | Real Estate [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Real Estate [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Pension [Member] | Real Estate [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 22.4 21.6 18.0
Postretirement Health and Life [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 162.6 201.8 186.0
Postretirement Health and Life [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 162.6 198.0  
Postretirement Health and Life [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 1.8  
Postretirement Health and Life [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 2.0  
Postretirement Health and Life [Member] | U.S. Large-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 26.7 [3] 40.1 [4]  
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 26.7 [3] 40.1 [4]  
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Large-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 25.5 [3] 37.3 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 25.5 [3] 37.3 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Mid-cap Growth [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 12.7 [3] 19.3 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 12.7 [3] 19.3 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | U.S. Small-cap [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | International [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 41.5 [3] 43.7 [4]  
Postretirement Health and Life [Member] | International [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 41.5 [3] 43.7 [4]  
Postretirement Health and Life [Member] | International [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | International [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 [3] 0.0 [4]  
Postretirement Health and Life [Member] | Mutual Funds [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 55.5 56.7  
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 55.5 56.7  
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Mutual Funds [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Fixed Income [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   1.8  
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   0.0  
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   1.8  
Postretirement Health and Life [Member] | Fixed Income [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   0.0  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.7 0.9  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.7 0.9  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Cash and Cash Equivalents [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets 0.0 0.0  
Postretirement Health and Life [Member] | Private Equity [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   2.0  
Postretirement Health and Life [Member] | Private Equity [Member] | Level 1 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   0.0  
Postretirement Health and Life [Member] | Private Equity [Member] | Level 2 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets   0.0  
Postretirement Health and Life [Member] | Private Equity [Member] | Level 3 [Member]      
Recurring Fair Value Measures [Line Items]      
Fair Value of Assets $ 0.0 $ 2.0 $ 1.7
[1] The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity and fixed income securities indexes.
[2] The underlying investments consist of actively-managed funds managed to achieve the returns of certain U.S. equity and fixed income securities indexes.
[3] The underlying investments consist of mutual funds (Level 1). 
[4] The underlying investments consist of mutual funds (Level 1).