Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019
Consolidated Balance Sheets
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, no par value	$ 0
Common stock, authorized shares		240.0
Common Stock, Shares Authorized, Unlimited [Fixed List]	Unlimited
Common stock, shares outstanding	59.4	59.9