Goodwill and Other Assets Schedule of Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 923.8	$ 906.4
Accumulated amortization	(170.3)	(133.5)
Net carrying amount	753.5	772.9
Internally-developed software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	159.0	151.0
Accumulated amortization	(64.2)	(53.2)
Net carrying amount	94.8	97.8
Development costs non-software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	48.7	48.4
Accumulated amortization	(15.7)	(9.7)
Net carrying amount	33.0	38.7
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	629.1	621.7
Accumulated amortization	(41.6)	(25.4)
Net carrying amount	587.5	596.3
Other intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	87.0	85.3
Accumulated amortization	(48.8)	(45.2)
Net carrying amount	$ 38.2	$ 40.1