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Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value of Debt
The fair value of the Company's Notes are estimated based on quoted market rates as well as borrowing rates currently available to the Company for loans with similar terms and average maturities (Level 2 inputs) (in millions).
 
March 31, 2019
 
December 31, 2018
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
Notes
$
864.5

 
$
910.0

 
$
864.5

 
$
901.2