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Commitments and Contingencies Schedule of Future Minimum Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [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
2019
$
352.0

 
$
(7.7
)
 
$
344.3

2020
324.3

 
(5.2
)
 
319.1

2021
282.3

 
(2.2
)
 
280.1

2022
242.5

 
(1.3
)
 
241.2

2023
184.0

 
(0.6
)
 
183.4

Thereafter
714.6

 
(0.5
)
 
714.1

Total
$
2,099.7

 
$
(17.5
)
 
$
2,082.2