Goodwill and Other Assets Schedule of Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 989.2	$ 1,007.7
Accumulated amortization	(521.7)	(505.4)
Net carrying amount	$ 467.5	502.3
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 10 months 24 days
Gross carrying amount	$ 681.5	698.7
Accumulated amortization	(263.0)	(251.0)
Net carrying amount	$ 418.5	447.7
Internally-developed software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years 1 month 6 days
Gross carrying amount	$ 181.8	178.2
Accumulated amortization	(138.5)	(132.2)
Net carrying amount	$ 43.3	46.0
Development costs non-software [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 10 months 24 days
Gross carrying amount	$ 50.1	51.5
Accumulated amortization	(48.4)	(47.5)
Net carrying amount	$ 1.7	4.0
Other intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years 8 months 12 days
Gross carrying amount	$ 75.8	79.3
Accumulated amortization	(71.8)	(74.7)
Net carrying amount	4.0	4.6
Other intangible asset, net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	307.7	309.0
Accumulated amortization	(258.7)	(254.4)
Net carrying amount	$ 49.0	$ 54.6