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Redeemable Noncontrolling Interest (Tables)
 12 Months Ended
Dec. 31, 2016
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
The changes in the components of redeemable NCI during the year ended December 31, 2016 and 2015, were:
(millions)
December 31, 2016
 
December 31, 2015
Balance, Beginning of period
$
464.9

 
$
0

Fair value at date of acquisition
0

 
411.5

Net income attributable to NCI
26.2

 
32.9

Other comprehensive income (loss) attributable to NCI
(3.2
)
 
(1.1
)
Purchase of shares from NCI
0

 
(12.6
)
Change in redemption value of NCI
(4.2
)
 
34.2

Balance, End of period
$
483.7

 
$
464.9