New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating profit		$ (49.6)	$ 186.9	$ 53.0	$ 44.9	$ 131.5	$ 87.3	$ 32.7	$ 29.8	$ 235.2	$ 281.3	$ 323.8
Prepaid expenses and other		(272.0)				(296.4)				(272.0)	(296.4)
Inventories		542.0				598.2				542.0	598.2
Other accrued liabilities		451.3				$ 405.6				451.3	405.6
Contract liabilities	$ 91.8	84.4								84.4
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating profit											$ 8.0	$ 1.9
Adjustments | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating profit										(12.2)
Reduction to equity, before tax	52.7
Reduction to equity, net of tax	41.1									41.1
Reduction to equity, tax	11.6
Prepaid expenses and other	54.9	(47.8)								(47.8)
Inventories	39.3	(42.8)								(42.8)
Other accrued liabilities	37.1	$ (38.0)								$ (38.0)
Contract liabilities	91.8
Accrued sales commission	$ (54.7)
Forecast | Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use asset													$ 200.0
Lease liability													$ 195.0