Goodwill and Other Assets Schedule of Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,009.7	$ 1,007.7
Accumulated amortization	(555.6)	(505.4)
Net carrying amount	$ 454.1	502.3
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 8 months 12 days
Gross carrying amount	$ 695.3	698.7
Accumulated amortization	(286.1)	(251.0)
Net carrying amount	$ 409.2	447.7
Internally-developed software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 8 months 12 days
Gross carrying amount	$ 187.1	178.2
Accumulated amortization	(146.9)	(132.2)
Net carrying amount	$ 40.2	46.0
Development costs non-software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 8 months 12 days
Gross carrying amount	$ 51.2	51.5
Accumulated amortization	(50.3)	(47.5)
Net carrying amount	$ 0.9	4.0
Other intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years 6 months
Gross carrying amount	$ 76.1	79.3
Accumulated amortization	(72.3)	(74.7)
Net carrying amount	3.8	4.6
Other intangible asset, net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	314.4	309.0
Accumulated amortization	(269.5)	(254.4)
Net carrying amount	$ 44.9	$ 54.6