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Acquisitions Acquisitions (Tables)
 9 Months Ended
Sep. 30, 2018
Business Combinations [Abstract]  
Cash Paid For Current And Prior Years' Acquisitions [Table Text Block]
The results of operations of our acquired companies were included in our consolidated results from the closing date of each acquisition. Details of cash paid for current and prior years' acquisitions are listed below.
 
Nine months ended
September 30,
 
2018
 
2017
Cost of investment: current-year acquisitions
$
12.3

 
$
28.1

Cost of investment: prior-year acquisitions
30.6

 
50.0

Less: net cash acquired
(0.5
)
 
(6.4
)
Total cost of investment
42.4

 
71.7

Operating payments 1
18.3

 
37.5

Total cash paid for acquisitions 2
$
60.7

 
$
109.2

 
1
Represents cash payments for amounts that have been recognized in operating expenses since the date of acquisition either relating to adjustments to estimates in excess of the initial value of contingent payments recorded or were contingent upon the future employment of the former owners of the acquired companies. Amounts are reflected in the operating section of the unaudited Consolidated Statements of Cash Flows.
2
Of the total cash paid for acquisitions, $12.0 and $22.6 for the nine months ended September 30, 2018 and 2017, respectively, are classified under the investing section of the unaudited Consolidated Statements of Cash Flows, as acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions. Of the total cash paid for acquisitions, $30.4 and $49.1 for the nine months ended September 30, 2018 and 2017, respectively, are classified under the financing section of the unaudited Consolidated Statements of Cash Flows as acquisition-related payments. These amounts relate 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,
 
2018
 
2017
Balance at beginning of period
$
252.1

 
$
252.8

Change in related noncontrolling interests balance
(15.5
)
 
(9.5
)
Changes in redemption value of redeemable noncontrolling interests:
 
 
 
Additions
0.0

 
3.4

Redemptions
(33.7
)
 
(18.5
)
Redemption value adjustments
(43.2
)
 
9.8

Balance at end of period
$
159.7

 
$
238.0