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Segment Information - Reportable Segment Revenue, Income (Loss) Before Income Taxes, (Provision) Benefit for Income Taxes and Net Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 3,118.3	$ 2,889.1	$ 8,932.4	$ 8,692.5
Income (loss) before income taxes	49.0	44.4	164.4	165.7
Loss due to catastrophic events	11.9		17.8	5.8
Asset impairments	10.3	23.2	10.8	27.4
U.S.
Segment Reporting Information [Line Items]
Revenues	2,422.8	2,200.2	6,764.3	6,456.5
Income (loss) before income taxes	54.6	43.4	164.8	152.9
Asset impairments	3.3	23.2	3.3	27.4
U.K.
Segment Reporting Information [Line Items]
Revenues	584.6	585.9	1,841.2	1,913.5
Income (loss) before income taxes	(7.4)	2.7	(2.7)	14.4
Asset impairments	7.0		7.0
Brazil
Segment Reporting Information [Line Items]
Revenues	110.9	103.0	326.9	322.5
Income (loss) before income taxes	$ 1.8	$ (1.7)	2.3	$ (1.6)
Asset impairments			$ 0.5

X

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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