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Commitments and Contingencies Schedule of Future Minimum Lease Commitments (Tables)
 12 Months Ended
Dec. 31, 2017
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
2018
$
335.0

 
$
(4.2
)
 
$
330.8

2019
312.1

 
(3.8
)
 
308.3

2020
285.3

 
(2.5
)
 
282.8

2021
251.4

 
(1.4
)
 
250.0

2022
204.1

 
(0.8
)
 
203.3

Thereafter
727.2

 
(0.5
)
 
726.7

Total
$
2,115.1

 
$
(13.2
)
 
$
2,101.9