Accounting Policies - Intangible assets (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Nov. 30, 2015	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015	Dec. 31, 2015
Intangible assets subject to amortization
Gross Carrying Amount		$ 301.7		$ 301.7		$ 301.2
Accumulated Amortization		(154.8)		(154.8)		(144.6)
Net Carrying Amount		146.9		146.9		156.6
Indefinite-lived intangible assets
Indefinite-lived intangible assets		36.5		36.5		36.2
Intangible assets
Gross Carrying Amount		338.2		338.2		337.4
Net Carrying Amount		183.4		$ 183.4		192.8
Weighted-average amortization				11 years 2 months 12 days
Aggregate amortization expense for amortized intangible assets		5.1	$ 5.2	$ 10.2	$ 10.3
Future amortization expense
Future amortization expense for remainder of 2016		10.1		10.1
Future amortization expense, 2017		19.4		19.4
Future amortization expense, 2018		16.6		16.6
Future amortization expense, 2019		12.6		12.6
Future amortization expense, 2020		12.2		12.2
Aerco Korea
Intangible assets
Net Carrying Amount		1.6		1.6
Patents
Intangible assets subject to amortization
Gross Carrying Amount		16.1		16.1		16.1
Accumulated Amortization		(14.5)		(14.5)		(14.1)
Net Carrying Amount		1.6		$ 1.6		2.0
Intangible assets
Weighted-average amortization				3 years 9 months 18 days
Customer relationships
Intangible assets subject to amortization
Gross Carrying Amount		215.0		$ 215.0		212.5
Accumulated Amortization		(109.6)		(109.6)		(102.1)
Net Carrying Amount		105.4		$ 105.4		110.4
Intangible assets
Weighted-average amortization				11 years 2 months 12 days
Customer relationships | Apex
Intangible assets
Weighted-average amortization	10 years
Customer relationships | Aerco Korea
Intangible assets
Weighted-average amortization				10 years
Technology
Intangible assets subject to amortization
Gross Carrying Amount		41.6		$ 41.6		41.3
Accumulated Amortization		(17.5)		(17.5)		(16.1)
Net Carrying Amount		24.1		$ 24.1		25.2
Intangible assets
Weighted-average amortization				9 years 1 month 6 days
Trade name
Intangible assets subject to amortization
Gross Carrying Amount		22.1		$ 22.1		21.9
Accumulated Amortization		(7.2)		(7.2)		(6.4)
Net Carrying Amount		14.9		$ 14.9		15.5
Intangible assets
Weighted-average amortization				14 years 2 months 12 days
Trade name | Apex
Intangible assets
Weighted-average amortization	15 years
Other
Intangible assets subject to amortization
Gross Carrying Amount		6.9		$ 6.9		9.4
Accumulated Amortization		(6.0)		(6.0)		(5.9)
Net Carrying Amount		$ 0.9		$ 0.9		$ 3.5
Intangible assets
Weighted-average amortization				20 years 3 months 18 days