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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2019
Fair Value Disclosures [Abstract]  
Fair Value of Debt The fair value of the Company's 2027 Notes, 2022 Notes and 2024 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).
 
September 30, 2019
 
December 31, 2018
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
2027 Notes
$
1,200.0

 
$
1,248.0

 
$

 
$

2022 Notes and 2024 Notes

 

 
864.5

 
901.2