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Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Debt
The fair value of debt is 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).
 
June 30, 2017
 
December 31, 2016
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
Debt
$
2,179.1

 
$
2,237.5

 
$
2,215.3

 
$
2,275.5