Other Income and Expense Footnotes (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2018 CAD ($)
Other income and expense [Line Items]
Nonoperating Income (Expense)	$ (235.0)	$ (284.5)		$ (272.0)
Affiliated Entity [Member] | Release of guarantee obligations [Member]
Other income and expense [Line Items]
Nonoperating Income (Expense)				$ 4.3	$ 5.8
Affiliated Entity [Member] | Acquisition purchase price adjustment settlement gain [Member]
Other income and expense [Line Items]
Nonoperating Income (Expense)		$ 1.5	$ 2.0