Goodwill and Other Assets Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 975.5	$ 154.2
Accumulated amortization	(105.8)	(86.7)
Net carrying amount	869.7	67.5
Internally-developed software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	159.4	92.4
Accumulated amortization	(47.7)	(48.5)
Net carrying amount	111.7	43.9
Development costs non-software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	51.7	1.1
Accumulated amortization	(4.0)	(0.6)
Net carrying amount	47.7	0.5
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	662.8	0.0
Accumulated amortization	(9.1)	0.0
Net carrying amount	653.7	0.0
Other intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	101.6	60.7
Accumulated amortization	(45.0)	(37.6)
Net carrying amount	$ 56.6	$ 23.1