Description of the Business and Summary of Significant Accounting Policies (Narrative) (Details) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended								6 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($) $ / shares	Dec. 31, 2015 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) region channel	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Property, Plant and Equipment [Line Items]
Number of business channels | channel												1
Number of regions where company has geographic operations | region												4
Foreign currency exchange rate decrease											25.00%
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)
Other income (expense), net												94.2	(7.1)	(34.6)	(172.9)
Income taxes												(103.1)	(129.9)	(100.7)
Prepaid expenses and other			252.1				272.0				$ 272.0	252.1	272.0
Brochure costs														244.0
Brochure income												96.9	117.0	139.4
Capitalized software			83.1				89.3				89.3	83.1	89.3
Amortization of capitalized software												24.7	26.5	29.5
SG&A expenses												2,627.5	2,972.1	3,231.0	$ 3,136.9
Advertising costs												72.9	127.6	118.4
Research and development costs												$ 40.6	48.0	52.9
Amortization period for gains and losses, period 1												3 years
Amortization period for gains and losses, period 2												5 years
Subsequent Event
Property, Plant and Equipment [Line Items]
Dividend paid (in USD per share) | $ / shares	$ 0.016
Payments of dividends	$ 9.0
Deferred Brochure Costs
Property, Plant and Equipment [Line Items]
Prepaid expenses and other			4.8				5.9				5.9	$ 4.8	5.9
Cost of sales
Property, Plant and Equipment [Line Items]
Brochure costs												101.1	113.5
SG&A expenses
Property, Plant and Equipment [Line Items]
Brochure costs												93.9	106.2
Shipping and Handling
Property, Plant and Equipment [Line Items]
SG&A expenses												$ 432.1	503.5	$ 530.8
Minimum
Property, Plant and Equipment [Line Items]
Prepaid brochures, campaign period												21 days
Number of years used in calculating the estimated fair value of reporting units												5 years
Maximum
Property, Plant and Equipment [Line Items]
Prepaid brochures, campaign period												28 days
Number of years used in calculating the estimated fair value of reporting units												10 years
Buildings
Property, Plant and Equipment [Line Items]
Estimated useful lives												45 years
Land Improvements
Property, Plant and Equipment [Line Items]
Estimated useful lives												20 years
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Estimated useful lives												15 years
Office Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives												5 years
Office Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives												10 years
Highly Inflationary Accounting
Property, Plant and Equipment [Line Items]
Foreign currency exchange rate decrease												36.00%
Operating profit											8.0	$ 11.0
Other income (expense), net											6.0	7.0
Income taxes											2.0	3.0
Highly Inflationary Accounting | Liability
Property, Plant and Equipment [Line Items]
Deconsolidation, carrying value of net assets			8.0				33.0				33.0	8.0	33.0
Highly Inflationary Accounting | Assets
Property, Plant and Equipment [Line Items]
Deconsolidation, carrying value of net assets			45.0				50.0				50.0	45.0	50.0
Highly Inflationary Accounting | Inventories
Property, Plant and Equipment [Line Items]
Deconsolidation, carrying value of net assets			23.0				32.0				32.0	23.0	32.0
Deferred Brochure Costs
Property, Plant and Equipment [Line Items]
Inventory			$ 8.9				$ 13.2				$ 13.2	$ 8.9	$ 13.2
Discontinued Operations | North America Segment
Property, Plant and Equipment [Line Items]
Cash contribution into privately-held company		$ 100.0
Percentage of ownership after transaction		20.00%
Affiliated Entity
Property, Plant and Equipment [Line Items]
Sale of convertible preferred stock		$ 435.0