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Accounting Policies - Intangible assets (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Nov. 30, 2015	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015	Dec. 31, 2015
Intangible assets subject to amortization
Gross Carrying Amount		$ 302.2		$ 302.2		$ 301.2
Accumulated Amortization		(160.0)		(160.0)		(144.6)
Net Carrying Amount		142.2		142.2		156.6
Indefinite-lived intangible assets
Indefinite-lived intangible assets		36.7		36.7		36.2
Intangible assets
Gross Carrying Amount		338.9		338.9		337.4
Net Carrying Amount		178.9		$ 178.9		192.8
Weighted-average amortization				11 years
Aggregate amortization expense for amortized intangible assets		5.1	$ 5.6	$ 15.3	$ 15.9
Amortization expense
Remainder of 2016		5.0		5.0
2017		19.5		19.5
2018		16.6		16.6
2019		12.6		12.6
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		(14.7)		(14.7)		(14.1)
Net Carrying Amount		1.4		$ 1.4		2.0
Intangible assets
Weighted-average amortization				3 years 8 months 12 days
Customer relationships
Intangible assets subject to amortization
Gross Carrying Amount		215.4		$ 215.4		212.5
Accumulated Amortization		(113.3)		(113.3)		(102.1)
Net Carrying Amount		102.1		$ 102.1		110.4
Intangible assets
Weighted-average amortization				11 years 1 month 6 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		(18.3)		(18.3)		(16.1)
Net Carrying Amount		23.3		$ 23.3		25.2
Intangible assets
Weighted-average amortization				8 years 10 months 24 days
Trade name
Intangible assets subject to amortization
Gross Carrying Amount		22.2		$ 22.2		21.9
Accumulated Amortization		(7.7)		(7.7)		(6.4)
Net Carrying Amount		14.5		$ 14.5		15.5
Intangible assets
Weighted-average amortization				14 years 1 month 6 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 2 months 12 days

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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