Accounting Policies - Intangible assets (Details) - USD ($) $ in Millions				12 Months Ended
	Nov. 02, 2016	Feb. 26, 2016	Nov. 30, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Intangible assets subject to amortization
Gross Carrying Amount				$ 332.6	$ 301.2
Accumulated Amortization				(165.4)	(144.6)
Net Carrying Amount				167.2	156.6
Indefinite-lived intangible assets
Indefinite-lived intangible assets				35.3	36.2
Intangible assets
Gross Carrying Amount				367.9	337.4
Net Carrying Amount				$ 202.5	192.8
Weighted-average amortization				11 years 6 months
Indefinite-lived intangible asset impairment				$ 0.4	0.6	$ 1.3
Aggregate amortization expense for amortized intangible assets				20.8	20.9	15.2
Amortization expense
2017				21.6
2018				18.4
2019				14.8
2020				14.4
2021				12.7
PVI Riverside Holdings, Inc Member
Intangible assets
Net Carrying Amount				$ 31.0
Weighted-average amortization				16 years 1 month 6 days
Apex
Intangible assets
Net Carrying Amount					$ 10.1
Weighted-average amortization					13 years
EMEA | Trade name
Intangible assets
Indefinite-lived intangible asset impairment				$ 0.4
Patents
Intangible assets subject to amortization
Gross Carrying Amount				16.1	$ 16.1
Accumulated Amortization				(14.9)	(14.1)
Net Carrying Amount				$ 1.2	2.0
Intangible assets
Weighted-average amortization				3 years 7 months 6 days
Customer relationships
Intangible assets subject to amortization
Gross Carrying Amount				$ 231.5	212.5
Accumulated Amortization				(117.3)	(102.1)
Net Carrying Amount				$ 114.2	110.4
Intangible assets
Weighted-average amortization				11 years 8 months 12 days
Customer relationships | PVI Riverside Holdings, Inc Member
Intangible assets
Net Carrying Amount				$ 17.6
Weighted-average amortization	15 years			15 years
Customer relationships | Apex
Intangible assets
Gross Carrying Amount					$ 8.4
Weighted-average amortization			10 years		10 years
Customer relationships | Aerco Korea
Intangible assets
Net Carrying Amount				$ 1.6
Weighted-average amortization		10 years		10 years
Technology
Intangible assets subject to amortization
Gross Carrying Amount				$ 53.1	$ 41.3
Accumulated Amortization				(19.2)	(16.1)
Net Carrying Amount				$ 33.9	25.2
Intangible assets
Weighted-average amortization				9 years 1 month 6 days
Technology | PVI Riverside Holdings, Inc Member
Intangible assets
Net Carrying Amount				$ 10.2
Weighted-average amortization	10 years			10 years
Trade name
Intangible assets subject to amortization
Gross Carrying Amount				$ 25.1	21.9
Accumulated Amortization				(8.1)	(6.4)
Net Carrying Amount				$ 17.0	15.5
Intangible assets
Weighted-average amortization				15 years 1 month 6 days
Trade name | PVI Riverside Holdings, Inc Member
Intangible assets
Gross Carrying Amount				$ 3.2
Weighted-average amortization	20 years			20 years
Trade name | Apex
Intangible assets
Gross Carrying Amount					$ 1.7
Weighted-average amortization			15 years		15 years
Trade name | Americas
Intangible assets
Indefinite-lived intangible asset impairment					$ 0.5	0.5
Trade name | EMEA
Intangible assets
Indefinite-lived intangible asset impairment					0.1	$ 0.8
Other
Intangible assets subject to amortization
Gross Carrying Amount				$ 6.8	9.4
Accumulated Amortization				(5.9)	(5.9)
Net Carrying Amount				$ 0.9	$ 3.5
Intangible assets
Weighted-average amortization				19 years 8 months 12 days