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Commitments and Contingencies Schedule of Net Rent Expense (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Net Rent Expense
Net rent expense is listed in the table below.
 
Years ended December 31,
 
2016
 
2015
 
2014
Gross rent expense
$
366.1

 
$
336.5

 
$
357.7

Third-party sublease rental income
(4.1
)
 
(5.5
)
 
(6.1
)
Net rent expense
$
362.0

 
$
331.0

 
$
351.6