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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fair Value of Debt
 
December 31, 2017
 
December 31, 2016
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
 
Nominal Unpaid Principal Balance
 
Aggregate Fair Value
Debt
$
2,174.3

 
$
2,260.9

 
$
2,215.3

 
$
2,275.5