Other Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,007.7	$ 1,033.8
Accumulated Amortization	(505.4)	(409.2)
Net Carrying Amount	502.3	624.6
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	97.6
Finite-Lived Intangible Assets, Amortization Expense, Year Two	87.1
Finite-Lived Intangible Assets, Amortization Expense, Year Three	84.4
Finite-Lived Intangible Assets, Amortization Expense, Year Four	82.3
Finite-Lived Intangible Assets, Amortization Expense, Year Five	80.6
Finite-Lived Intangible Assets, Net	$ 432.0
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 2 months 12 days
Gross Carrying Amount	$ 698.7	712.2
Accumulated Amortization	(251.0)	(179.1)
Net Carrying Amount	$ 447.7	533.1
Software and Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 9 months 18 days
Gross Carrying Amount	$ 178.2	189.6
Accumulated Amortization	(132.2)	(118.9)
Net Carrying Amount	$ 46.0	70.7
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year 2 months 12 days
Gross Carrying Amount	$ 51.5	52.5
Accumulated Amortization	(47.5)	(44.3)
Net Carrying Amount	$ 4.0	8.2
Other Intangible Assets, Net [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	2 years 10 months 24 days
Gross Carrying Amount	$ 79.3	79.5
Accumulated Amortization	(74.7)	(66.9)
Net Carrying Amount	4.6	12.6
Other intangible asset, net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	309.0	321.6
Accumulated Amortization	(254.4)	(230.1)
Net Carrying Amount	$ 54.6	$ 91.5