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Fair Value (Fair Value of Assets and Liabilities Measured on Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Level 1 [Member]    
Investments, Fair Value Disclosure $ 0.4 $ 0.3
Total Assets 0.4 0.3
Total Liabilities 0.0 0.0
Level 1 [Member] | Subsidiaries [Member]    
Total Assets 0.4 0.3
Total Liabilities 0.0 0.0
Level 2 [Member]    
Investments, Fair Value Disclosure 8.7 8.6
Total Assets 8.7 8.6
Total Liabilities 1,516.8 1,554.2
Level 2 [Member] | Subsidiaries [Member]    
Total Assets 8.7 8.6
Total Liabilities 618.3 638.6
Level 3 [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Total Assets 0.0 0.0
Total Liabilities 17.2 17.4
Level 3 [Member] | Subsidiaries [Member]    
Total Assets 0.0 0.0
Total Liabilities 17.2 17.4
Fair Value [Member]    
Investments, Fair Value Disclosure 9.1 8.9
Total Assets 9.1 8.9
Total Liabilities 1,534.0 1,571.6
Fair Value [Member] | Subsidiaries [Member]    
Total Assets 9.1 8.9
Total Liabilities 635.5 656.0
Money Market Funds [Member] | Level 1 [Member]    
Investments, Fair Value Disclosure 0.4 0.3
Money Market Funds [Member] | Level 1 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.4 0.3
Money Market Funds [Member] | Level 2 [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Money Market Funds [Member] | Level 2 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Money Market Funds [Member] | Level 3 [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Money Market Funds [Member] | Level 3 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Money Market Funds [Member] | Fair Value [Member]    
Investments, Fair Value Disclosure 0.4 0.3
Money Market Funds [Member] | Fair Value [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.4 0.3
Equity Securities [Member] | Level 1 [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Equity Securities [Member] | Level 1 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Equity Securities [Member] | Level 2 [Member]    
Investments, Fair Value Disclosure 4.9 4.5
Equity Securities [Member] | Level 2 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 4.9 4.5
Equity Securities [Member] | Level 3 [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Equity Securities [Member] | Level 3 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Equity Securities [Member] | Fair Value [Member]    
Investments, Fair Value Disclosure 4.9 4.5
Equity Securities [Member] | Fair Value [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 4.9 4.5
Debt Securities [Member] | Level 1 [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Debt Securities [Member] | Level 1 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Debt Securities [Member] | Level 2 [Member]    
Investments, Fair Value Disclosure 3.8 4.1
Debt Securities [Member] | Level 2 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 3.8 4.1
Debt Securities [Member] | Level 3 [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Debt Securities [Member] | Level 3 [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 0.0 0.0
Debt Securities [Member] | Fair Value [Member]    
Investments, Fair Value Disclosure 3.8 4.1
Debt Securities [Member] | Fair Value [Member] | Subsidiaries [Member]    
Investments, Fair Value Disclosure 3.8 4.1
Debt [Member] | Level 1 [Member]    
Debt 0.0 0.0
Debt [Member] | Level 1 [Member] | Subsidiaries [Member]    
Debt 0.0 0.0
Debt [Member] | Level 2 [Member]    
Debt 1,516.8 1,554.2
Debt [Member] | Level 2 [Member] | Subsidiaries [Member]    
Debt 618.3 638.6
Debt [Member] | Level 3 [Member]    
Debt 17.2 17.4
Debt [Member] | Level 3 [Member] | Subsidiaries [Member]    
Debt 17.2 17.4
Debt [Member] | Fair Value [Member]    
Debt 1,534.0 1,571.6
Debt [Member] | Fair Value [Member] | Subsidiaries [Member]    
Debt $ 635.5 $ 656.0