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Financial Instruments (Tables)
 3 Months Ended
Mar. 31, 2019
Fair Value Disclosures [Abstract]  
Estimated Fair Value of Financial Instruments The estimated fair values of our financial instruments are as follows: 

 

 

March 31, 2019

 

 

December 31, 2018

 

 

 

Carrying

amount

 

 

Estimated

fair value

 

 

Carrying

amount

 

 

Estimated

fair value

 

Assets/(Liabilities), net:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total long-term debt, including current portion

 

$

(812.2

)

 

$

(812.8

)

 

$

(819.8

)

 

$

(811.3

)

Interest rate swap contracts

 

 

(3.3

)

 

 

(3.3

)

 

 

3.5

 

 

 

3.5