Segment Information - Assets and Goodwill (Details) - USD ($) $ in Millions	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Feb. 08, 2019	Feb. 07, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Assets	$ 9,185.4			$ 9,112.8
Goodwill	2,853.9	$ 2,848.0	$ 2,850.8	2,840.1	$ 2,967.4	$ 2,792.6	$ 2,797.6	$ 773.5		$ 0.0
Other intangibles	4,925.3	$ 5,022.3	$ 5,143.4	5,251.4	$ 5,254.0	$ 5,361.3	$ 5,488.1		$ 281.1	$ 0.0
Other long-lived assets	668.7			590.8
Total long-lived assets	8,447.9			8,682.3
North America
Segment Reporting Information [Line Items]
Assets	8,519.3			8,480.1
Goodwill	2,745.5			2,734.6
Other intangibles	4,640.8			4,953.0
Other long-lived assets	563.4			500.9
International
Segment Reporting Information [Line Items]
Assets	666.1			632.7
Goodwill	108.4			105.5
Other intangibles	284.5			298.4
Other long-lived assets	$ 105.3			$ 89.9