Accounting Policies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
Item Effected [Line Items]
Selling, General and Administrative Expense	$ 1,125.0	$ 1,026.6	$ 986.3
Non-operating expenses	30.6	24.8	26.0
Outgoing freight expenses	$ 62.0	54.5	50.9
Operating Lease, Residual Value of Leased Asset				$ 100.0
As Reported
Item Effected [Line Items]
Selling, General and Administrative Expense		1,047.2	1,008.7
Non-operating expenses		4.2	3.6
Reclassification
Item Effected [Line Items]
Selling, General and Administrative Expense		(20.6)	(22.4)
Non-operating expenses		$ 20.6	$ 22.4