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Fair Value Measurements (Assets Measured at Fair Value on a Non-recurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain buildings and improvements $ 0.0 $ 0.0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain buildings and improvements 0.0 0.0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain buildings and improvements $ 5.7 $ 2.3