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Interim Financial Statements - Fair Value, Assets Held For Sale, Discontinued Operations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($) item entity	Sep. 30, 2020 USD ($) entity	Jun. 30, 2021 USD ($)	Dec. 31, 2020 USD ($)
Fair Value of Financial Instruments
Debt instrument, Carrying Value	$ 1,424.6			$ 1,689.6
Assets Held for Sale and Discontinued Operations
Number of entities newly classified as held for sale | entity	0	0
3.50% senior subordinated notes due 2025
Fair Value of Financial Instruments
Interest rate (as a percent)	3.50%	3.50%		3.50%
Debt instrument, Carrying Value	$ 544.3			$ 543.2
Debt instrument, Fair Value	561.3			$ 554.6
Senior unsecured notes issued	$ 550.0
3.75% senior subordinated notes due 2029
Fair Value of Financial Instruments
Interest rate (as a percent)	3.75%		3.75%	3.75%
Debt instrument, Carrying Value	$ 494.1
Debt instrument, Fair Value	497.5
Senior unsecured notes issued	$ 500.0		$ 500.0
5.50% senior subordinated notes due 2026
Fair Value of Financial Instruments
Interest rate (as a percent)	5.50%		5.50%	5.50%
Debt instrument, Carrying Value				$ 496.4
Senior unsecured notes issued	$ 500.0		$ 500.0
Repayments of senior subordinated notes	500.0
3.75% senior subordinated notes redeemed August 15, 2020
Fair Value of Financial Instruments
Interest rate (as a percent)		3.75%
Repayments of senior subordinated notes		$ 300.0
Mortgage facilities
Fair Value of Financial Instruments
Debt instrument, Carrying Value	319.8			458.1
Debt instrument, Fair Value	$ 326.1			$ 474.7
Retail Automotive Franchise | Disposal group, not discontinued operations
Disposals
Number of franchises disposed | item	1

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