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Redeemable Noncontrolling Interest (Tables)
 12 Months Ended
Dec. 31, 2019
Noncontrolling Interest [Abstract]  
Redeemable Noncontrolling Interest [Table Text Block]
The changes in the components of redeemable NCI during the years ended December 31, were:
(millions)
2019
2018
2017
Balance, beginning of year
$
214.5

$
503.7

$
483.7

Net income attributable to NCI
9.7

5.7

5.9

Other comprehensive income (loss) attributable to NCI1
4.6

(3.3
)
2.3

Exercise of stock options
7.7

9.4

3.4

Purchase/change of ARX minority shares
(11.2
)
(298.2
)
0

Change in redemption value
0.3

(2.8
)
8.4

Balance, end of year
$
225.6

$
214.5

$
503.7

1 Amount represents the other comprehensive income (loss) attributable to NCI, as reflected on the consolidated statements of comprehensive income; changes in accumulated other comprehensive income (loss) attributable to NCI due to a change in the minority ownership percentage does not impact the amount of redeemable NCI.