New Accounting Standards (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
	Jan. 01, 2018	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2020	Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets		$ 175.4								$ 175.4					$ 187.5
Present value of lease liabilities		189.0								189.0
Prepaid expenses and other		(252.1)				$ (272.0)				(252.1)	$ (272.0)
Inventories		452.3				542.0				452.3	542.0
Other accrued liabilities		410.7				451.3				410.7	451.3
Contract liabilities		51.0				84.4				51.0	84.4
Operating profit		$ 1.3	$ 97.7	$ 30.5	$ (3.9)	(49.6)	$ 186.9	$ 53.0	$ 44.9	$ 125.6	235.2	$ 281.3	$ 323.8
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets															191.0
Present value of lease liabilities															$ 204.0
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating profit												$ 8.0	$ 1.9
Accounting Standards Update 2016-13 | Forecast
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets														$ 2.0
Adjustments | Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
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
Sales incentive accrual	$ 54.7
Operating profit											$ (12.2)