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Redeemable Noncontrolling Interest (Tables) | 12 Months Ended
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Dec. 31, 2017
Noncontrolling Interest [Abstract] |
Redeemable Noncontrolling Interest [Table Text Block] | The changes in the components of redeemable NCI during the year ended December 31, 2017, 2016, and 2015, were:
(millions) | December 31, 2017 |  | December 31, 2016 |  | December 31, 2015
Balance, Beginning of period | $ | 483.7 |  |  | $ | 464.9 |  |  | $ | 0 |
Fair value at date of acquisition | 0 |  |  | 0 |  |  | 411.5 |
Net income attributable to NCI | 5.9 |  |  | 26.2 |  |  | 32.9 |
Other comprehensive income (loss) attributable to NCI | 2.3 |  |  | (3.2 | ) |  | (1.1 | )
Exercise of employee stock options | 3.4 |  |  | 0 |  |  | 0 |
Purchase of shares from NCI | 0 |  |  | 0 |  |  | (12.6 | )
Change in redemption value of NCI | 8.4 |  |  | (4.2 | ) |  | 34.2 |
Balance, End of period | $ | 503.7 |  |  | $ | 483.7 |  |  | $ | 464.9 |

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- Definition Tabular disclosure of redeemable noncontrolling interest (as defined) included in the statement of financial position as either a liability or temporary equity. As of the date of the statement of financial position, such redeemable noncontrolling interest is currently redeemable, as defined, for cash or other assets of the entity at (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the entity. + References No definition available. + Details
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