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Redeemable Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2017
Temporary Equity Disclosure [Abstract]  
Redeemable Noncontrolling Interest
The changes in the components of redeemable NCI during the six months ended June 30, 2017 and 2016, and the year ended December 31, 2016, were:
(millions)
June 30, 2017

 
June 30, 2016

 
December 31, 2016

Balance, Beginning of period
$
483.7

 
$
464.9

 
$
464.9

Net income attributable to NCI
11.1

 
4.5

 
26.2

Other comprehensive income (loss) attributable to NCI
2.2

 
3.5

 
(3.2
)
Exercise of employee stock options
3.4

 
0

 
0

Change in redemption value of NCI
1.4

 
(6.1
)
 
(4.2
)
Balance, End of period
$
501.8

 
$
466.8

 
$
483.7