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Selected Quarterly Financial Data (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenues	$ 3,111.4	$ 3,118.3	$ 3,005.7	$ 2,808.4	$ 2,908.8	$ 2,889.1	$ 2,943.5	$ 2,860.0		$ 12,043.8	$ 11,601.4	$ 11,123.7
Gross profit	464.6	465.6	454.3	431.5	432.1	435.1	438.2	419.8		1,816.0	1,725.1	1,645.5
Income (loss) from operations	96.5	83.3	97.1	86.8	74.7	78.2	109.2	79.1		363.7	341.1	341.9
Net income (loss)	$ 48.1	$ 38.0	$ 49.2	$ 38.6	$ 30.7	$ 34.8	$ 56.5	$ 35.8		$ 174.0	$ 157.8	$ 213.4
Basic earnings (loss) per share (in dollars per share)	$ 2.57	$ 2.04	$ 2.65	$ 2.09	$ 1.62	$ 1.74	$ 2.72	$ 1.70		$ 9.35	$ 7.83	$ 10.08
Diluted earnings (loss) per share (in dollars per share)	$ 2.57	$ 2.04	$ 2.64	$ 2.08						$ 9.34	$ 7.83	$ 10.08
Loss due to catastrophic events		$ 11.9	$ 4.0	$ 2.0	$ 0.6		$ 5.8			$ 16.0	$ 6.1	$ 5.0
Net gains (losses) on legal settlements						$ 3.1	0.5
Asset impairment charges	$ 11.5	$ 10.3	$ 0.5		16.5		4.3		$ 23.2	22.2	43.9	$ 19.5
Gain related to real estate and dealership dispositions					$ (0.3)	$ 5.4	$ 20.1			$ 5.0	$ 24.4

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