Restructuring Activities Restructuring Activities (Impairment Fair Value) (Details) - USD ($) $ in Millions	3 Months Ended	4 Months Ended	12 Months Ended
	Dec. 29, 2018	Dec. 31, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restructuring costs - SG&A			$ 0.0	$ 72.9	$ 34.9
Property, plant and equipment, net	$ 130.9		130.9	136.7
Indefinite-lived intangibles	604.5	$ 678.5	604.5	604.5	678.5
Impairment of intangible assets			$ 0.0	$ 68.6	$ 7.1
Indefinite-lived Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets	$ 68.6
Stride Rite [Member] | Indefinite-lived Intangible Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of intangible assets		$ 7.1