Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Accrued Liabilities, Current [Abstract]
Payroll and other employee liabilities	$ 157.6	$ 123.2
Taxes, except income taxes	95.7	80.8
Income taxes payable	26.0	23.2
Acquisition-related obligations	18.0	0.0
Workers’ compensation and other claims	16.8	19.2
Cash held by Cash Management Services operations(a)	16.1	9.8
Cash supply chain deposit liability	10.9	0.0
Retirement benefits (see Note 3)	10.2	9.1
Other	137.2	120.4
Accrued liabilities	$ 488.5	$ 385.7