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Redeemable Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2018
Temporary Equity Disclosure [Abstract]  
Redeemable Noncontrolling Interest
The changes in the components of redeemable NCI during the six months ended June 30, 2018 and 2017, and the year ended December 31, 2017, were:
(millions)
June 30, 2018

 
June 30, 2017

 
December 31, 2017

Balance, Beginning of period
$
503.7

 
$
483.7

 
$
483.7

Net income attributable to NCI
8.8

 
11.1

 
5.9

Other comprehensive income (loss) attributable to NCI
(4.6
)
 
2.2

 
2.3

Exercise of employee stock options
9.4

 
3.4

 
3.4

Purchase of ARX shares
(295.9
)
 
0

 
0

Change in redemption value of NCI
(3.2
)
 
1.4

 
8.4

Balance, End of period
$
218.2

 
$
501.8

 
$
503.7