Other Assets (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months		$ 147.9
Goodwill, Purchase Accounting Adjustments		(2.9)	$ (0.5)
Gross Carrying Amount		1,074.2	906.4
Accumulated Amortization		(300.4)	(133.5)
Net Carrying Amount		$ 773.8	772.9
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 years 1 month
Amortization expense on capitalized software		$ 34.6	24.4	$ 14.5
Impairment of assets		3.1	9.8	$ 18.9
Amortization		159.3	73.0
Finite-Lived Intangible Assets, Amortization Expense, Year Two		125.1
Finite-Lived Intangible Assets, Amortization Expense, Year Three		96.2
Finite-Lived Intangible Assets, Amortization Expense, Year Four		86.0
Finite-Lived Intangible Assets, Amortization Expense, Year Five		78.2
Finite-Lived Intangible Assets, Net		533.4
Software and Software Development Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		192.9	151.0
Accumulated Amortization		(99.8)	(53.2)
Net Carrying Amount		$ 93.1	97.8
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		2 years 7 months
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 55.3	48.4
Accumulated Amortization		(35.1)	(9.7)
Net Carrying Amount		$ 20.2	38.7
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year 4 months
Customer-Related Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 741.5	621.7
Accumulated Amortization		(108.2)	(25.4)
Net Carrying Amount		$ 633.3	596.3
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		7 years 8 months
Other intangible assets, net
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 84.5	85.3
Accumulated Amortization		(57.3)	(45.2)
Net Carrying Amount		$ 27.2	40.1
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		1 year 8 months
Other intangible asset, net [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount		$ 332.7	284.7
Accumulated Amortization		(192.2)	(108.1)
Net Carrying Amount		$ 140.5	176.6
VENEZUELA
Finite-Lived Intangible Assets [Line Items]
Impairment of assets	$ 18.6
Write-off of uncollectible accounts receivable			$ 0.4