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

6 Months Ended

Jun. 30, 2019

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

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

	Three months ended				Six months ended
	June 30,				June 30,
(Millions)	2019		2018		2019	2018
Common shares:
Shares issued and outstanding, beginning of period		115,262,303		120,000,000	115,151,251	120,000,000
Issuance of shares to directors and employees		34,615		—	145,667	—
Shares issued and outstanding, end of period		115,296,918		120,000,000	115,296,918	120,000,000

Schedule of change in non-controlling interest

	For the three months ended		For the three months ended
(Millions)	June 30, 2019		June 30, 2018
Non-controlling interests, beginning of the period	$	2.2	$	0.5
Net income attributable to non-controlling interests		0.8		0.4
Other, net		—		0.1
Non-controlling interests , end of the period	$	3.0	$	1.0

	For the six months ended		For the six months ended
(Millions)	June 30, 2019		June 30, 2018
Non-controlling interests, beginning of the period	$	1.7	$	0.2
Net income attributable to non-controlling interests		1.2		0.6
Other, net		0.1		0.2
Non-controlling interests , end of the period	$	3.0	$	1.0