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Commitments and Contingencies Schedule of Net Rent Expense (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Net Rent Expense
Net rent expense is listed in the table below.
 
Years ended December 31,
 
2015
 
2014
 
2013
Gross rent expense
$
336.5

 
$
357.7

 
$
366.1

Third-party sublease rental income
(5.5
)
 
(6.1
)
 
(16.1
)
Net rent expense
$
331.0

 
$
351.6

 
$
350.0