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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Summary of Carrying Value and Estimated Fair Value of Long-Term Debt The following table summarizes the carrying value and estimated fair value of these financial instruments as of September 30, 2019 and December 31, 2018, respectively:
 
 
 
2019
 
2018
 
Fair Value Hierarchy
 
Carrying
Value
 
Estimated
Fair Value
 
Carrying
Value
 
Estimated
Fair Value
Financial instruments not carried at fair value:
 
 
 
 
 
 
 
 
 
 
 
 
 
Long-term debt excluding finance lease liabilities and syndicated revolving credit facility debt issuance costs
Level 2
 
$
2,649.7

 
$
2,906.3

 
$
2,031.0

 
$
2,347.4