Goodwill and Other Assets Schedule of Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Document Period End Date	Jun. 30, 2017
Gross carrying amount	$ 992.9	$ 906.4
Accumulated amortization	(214.8)	(133.5)
Net carrying amount	778.1	772.9
Internally-developed software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	172.4	151.0
Accumulated amortization	(76.7)	(53.2)
Net carrying amount	95.7	97.8
Development costs non-software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	52.2	48.4
Accumulated amortization	(23.4)	(9.7)
Net carrying amount	28.8	38.7
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	681.0	621.7
Accumulated amortization	(63.4)	(25.4)
Net carrying amount	617.6	596.3
Other intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	87.3	85.3
Accumulated amortization	(51.3)	(45.2)
Net carrying amount	$ 36.0	$ 40.1