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Common shareholder's equity, mezzanine equity, and non-controlling interests (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020, 2019, and 2018, respectively:
202020192018
Common shares:
Shares issued and outstanding, beginning of year115,299,341 115,151,251 120,000,000 
Issuance of shares (See Note 3)
— 148,090 4,670,531 
Shares redeemed (See Note 3)
— — (9,519,280)
Shares issued and outstanding, end of year115,299,341 115,299,341 115,151,251 
Schedule of change in non-controlling interest
The following table shows the change in non-controlling interest for the years ended December 31, 2020, 2019 and 2018:
(Millions)Total
Non-controlling interests as of December 31, 2017$0.2 
Net income attributable to non-controlling interests1.4 
Dividends to non-controlling interests— 
Other, net0.1 
Non-controlling interests as of December 31, 2018$1.7 
Net income attributable to non-controlling interests1.7 
Dividends to non-controlling interests(1.0)
Other, net— 
Non-controlling interests as of December 31, 2019$2.4 
Net income attributable to non-controlling interests0.1 
Dividends to non-controlling interests(2.2)
Other, net— 
Non-controlling interests as of December 31, 2020$0.3