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Fair Value - Recurring Fair Value Measures (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Investments [Abstract]    
Cash Equivalents $ 1.5 $ 3.8
Recurring Fair Value Measures [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 12.7 [1] 10.2 [2]
Available-for-sale – Corporate and Governmental Debt Securities 8.3 [1] 8.9 [2]
Cash Equivalents 1.5 [1] 3.8 [2]
Total Fair Value of Assets 22.5 22.9
Liabilities [Abstract]    
Deferred Compensation 20.5 [3] 18.2 [4]
U.S. Water Services Contingent Consideration 5.7 [5] 5.4 [4]
Total Fair Value of Liabilities 26.2 23.6
Total Net Fair Value of Assets (Liabilities) (3.7) (0.7)
Activity in Level 3 [Roll Forward]    
Transfers In or Out, All Levels 0.0 0.0
Recurring Fair Value Measures [Member] | Level 1 [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 12.7 [1] 10.2 [2]
Available-for-sale – Corporate and Governmental Debt Securities 0.0 [1] 0.0 [2]
Cash Equivalents 1.5 [1] 3.8 [2]
Total Fair Value of Assets 14.2 14.0
Liabilities [Abstract]    
Deferred Compensation 0.0 [3] 0.0 [4]
U.S. Water Services Contingent Consideration 0.0 [5] 0.0 [4]
Total Fair Value of Liabilities 0.0 0.0
Total Net Fair Value of Assets (Liabilities) 14.2 14.0
Recurring Fair Value Measures [Member] | Level 2 [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 0.0 [1] 0.0 [2]
Available-for-sale – Corporate and Governmental Debt Securities 8.3 [1] 8.9 [2]
Cash Equivalents 0.0 [1] 0.0 [2]
Total Fair Value of Assets 8.3 8.9
Liabilities [Abstract]    
Deferred Compensation 20.5 [3] 18.2 [4]
U.S. Water Services Contingent Consideration 0.0 [5] 0.0 [4]
Total Fair Value of Liabilities 20.5 18.2
Total Net Fair Value of Assets (Liabilities) (12.2) (9.3)
Recurring Fair Value Measures [Member] | Level 3 [Member]    
Investments [Abstract]    
Available-for-sale – Equity Securities 0.0 [1] 0.0 [2]
Available-for-sale – Corporate and Governmental Debt Securities 0.0 [1] 0.0 [2]
Cash Equivalents 0.0 [1] 0.0 [2]
Total Fair Value of Assets 0.0 0.0
Liabilities [Abstract]    
Deferred Compensation 0.0 [3] 0.0 [4]
U.S. Water Services Contingent Consideration 5.7 [5] 5.4 [4]
Total Fair Value of Liabilities 5.7 5.4
Total Net Fair Value of Assets (Liabilities) (5.7) (5.4)
Activity in Level 3 [Roll Forward]    
Beginning Balance 5.4  
Ending Balance 5.7 $ 5.4
Recurring Fair Value Measures [Member] | Level 3 [Member] | Accretion [Member]    
Activity in Level 3 [Roll Forward]    
Accretion $ 0.3  
[1] Included in Other Investments on the Consolidated Balance Sheet.
[2] Included in Other Investments on the Consolidated Balance Sheet.
[3] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
[4] Included in Other Non-Current Liabilities on the Consolidated Balance Sheet.
[5] Included in Other Current Liabilities on the Consolidated Balance Sheet.