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Commitments and Contingencies Schedule of Future Minimum Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2015
Schedule of Net Benefit Costs [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Cash amounts for future minimum lease commitments for office premises and equipment under non-cancelable leases, along with minimum sublease rental income to be received under non-cancelable subleases, are listed in the table below.
Period
Rent
Obligations
 
Sublease Rental
Income
 
Net Rent
2016
$
322.0

 
$
(4.4
)
 
$
317.6

2017
300.4

 
(1.9
)
 
298.5

2018
272.2

 
(0.8
)
 
271.4

2019
246.1

 
(0.7
)
 
245.4

2020
224.5

 
0.0

 
224.5

Thereafter
909.0

 
0.0

 
909.0

Total
$
2,274.2

 
$
(7.8
)
 
$
2,266.4