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Commitments and Contingencies Schedule of Net Rent Expense (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Net Rent Expense
Net rent expense is listed in the table below.
 
Years ended December 31,
 
2018
 
2017
 
2016
Gross rent expense
$
375.9

 
$
371.0

 
$
366.1

Third-party sublease rental income
(5.3
)
 
(4.6
)
 
(4.1
)
Net rent expense
$
370.6

 
$
366.4

 
$
362.0