Goodwill and Intangibles - Goodwill (Details) $ in Millions	3 Months Ended		12 Months Ended	15 Months Ended
	Mar. 29, 2020 USD ($) item	Mar. 31, 2019 USD ($) item	Dec. 31, 2019 USD ($)	Mar. 29, 2020 USD ($) item
Gross Balance
Balance at the beginning of the period	$ 748.2	$ 711.9	$ 711.9	$ 711.9
Acquired During the Period			38.3
Foreign Currency Translation and Other	(5.1)		(2.0)
Balance at the end of the period	743.1		748.2	743.1
Accumulated Impairment Losses
Balance at the beginning of the period	(167.1)	$ (167.1)	(167.1)	(167.1)
Balance at the end of the period	(167.1)		(167.1)	(167.1)
Net Goodwill	$ 576.0		581.1	$ 576.0
Number of reporting units | item	7	7		7
Heating and Hot Water Solutions
Gross Balance
Balance at the end of the period	$ 218.9			$ 218.9
Americas
Gross Balance
Balance at the beginning of the period	476.8	$ 438.1	438.1	438.1
Acquired During the Period			38.3
Foreign Currency Translation and Other	(0.8)		0.4
Balance at the end of the period	476.0		476.8	476.0
Accumulated Impairment Losses
Balance at the beginning of the period	(24.5)	(24.5)	(24.5)	(24.5)
Balance at the end of the period	(24.5)		(24.5)	(24.5)
Net Goodwill	451.5		452.3	451.5
Europe
Gross Balance
Balance at the beginning of the period	241.4	243.7	243.7	243.7
Foreign Currency Translation and Other	(2.4)		(2.3)
Balance at the end of the period	239.0		241.4	239.0
Accumulated Impairment Losses
Balance at the beginning of the period	(129.7)	(129.7)	(129.7)	(129.7)
Balance at the end of the period	(129.7)		(129.7)	(129.7)
Net Goodwill	109.3		111.7	109.3
APMEA
Gross Balance
Balance at the beginning of the period	30.0	30.1	30.1	30.1
Foreign Currency Translation and Other	(1.9)		(0.1)
Balance at the end of the period	28.1		30.0	28.1
Accumulated Impairment Losses
Balance at the beginning of the period	(12.9)	$ (12.9)	(12.9)	(12.9)
Balance at the end of the period	(12.9)		(12.9)	(12.9)
Net Goodwill	$ 15.2		$ 17.1	$ 15.2