Common shareholder's equity, mezzanine equity, and non-controlling interests (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of changes in the company's issued and outstanding common shares

The following table presents changes in the Company's issued and outstanding Common shares for the years ended December 31, 2019, 2018, and 2017, respectively:

	2019	2018		2017
Common shares:
Shares issued and outstanding, beginning of year	115,151,251	120,000,000		120,000,000
Issuance of shares (SeeNote 3)	148,090	4,670,531		—
Shares redeemed (SeeNote 3)	—	(9,519,280	)	—
Shares issued and outstanding, end of year	115,299,341	115,151,251		120,000,000

Schedule of change in non-controlling interest

The following table shows the change in non-controlling interest for the years ended December 31, 2019, 2018, and 2017:

(Millions)	Total
Non-controlling interests as of December 31, 2016	$	251.3
Net income attributable to non-controlling interests	13.7
Dividends to non-controlling interests	(14.1		)
Other, net	(250.7		)
Non-controlling interests as of December 31, 2017	$	0.2
Net income attributable to non-controlling interests	1.4
Dividends to non-controlling interests	—
Other, net	0.1
Non-controlling interests as of December 31, 2018	$	1.7
Net income attributable to non-controlling interests	1.7
Dividends to non-controlling interests	(1.0		)
Other, net	—
Non-controlling interests as of December 31, 2019	$	2.4