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Acquisitions (Tables)
 9 Months Ended
Sep. 30, 2016
Business Combinations [Abstract]  
Cash Paid For Current And Prior Years' Acquisitions [Table Text Block]
Details of cash paid for current and prior years' acquisitions are listed below.
 
Nine months ended
September 30,
 
2016
 
2015
Cost of investment: current-year acquisitions
$
61.0

 
$
8.3

Cost of investment: prior-year acquisitions
37.2

 
31.8

Less: net cash acquired
(13.6
)
 
(2.4
)
Total cost of investment
84.6

 
37.7

Operating expense 1
18.7

 
17.6

Total cash paid for acquisitions 2
$
103.3

 
$
55.3

 
1
Represents cash payments made that were either in excess of the initial value of contingent payments or contingent upon the future employment of the former owners of the acquired companies and are recorded in the operating section of the unaudited Consolidated Statements of Cash Flows.
2
$47.9 of cash paid for acquisitions for the nine months ended September 30, 2016 is classified under the investing section of the unaudited Consolidated Statements of Cash Flows, as acquisitions, net of cash acquired. This amount relates to initial payments for new transactions. $36.7 of cash paid for acquisitions for the nine months ended September 30, 2016 is classified under the financing section of the unaudited Consolidated Statements of Cash Flows as acquisition-related payments. This amount relates to deferred payments and increases in our ownership interest for prior acquisitions.
Redeemable Noncontrolling Interest [Table Text Block]
The following table presents changes in our redeemable noncontrolling interests.
 
Nine months ended
September 30,
 
2016
 
2015
Balance at beginning of period
$
251.9

 
$
257.4

Change in related noncontrolling interests balance
(1.5
)
 
(9.4
)
Changes in redemption value of redeemable noncontrolling interests:
 
 
 
Additions
6.8

 
0.5

Redemptions and other
(14.8
)
 
(24.4
)
Redemption value adjustments
4.5

 
2.4

Balance at end of period
$
246.9

 
$
226.5