Goodwill and Other Intangible Assets - Gross carrying amount and accumulated amortization of the company's intangible assets other than goodwill (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Intangible asset balances by major asset class
Finite-lived Intangible assets, amortization amount	$ (46.4)	$ (45.3)
Intangible assets, gross (excluding goodwill)	161.2	159.4
Intangible assets, book value	114.8	114.1
Customer relationships
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	10.6	10.3
Finite-lived Intangible assets, amortization amount	(8.3)	(7.8)
Finite-lived intangible assets, book value	2.3	2.5
Patents
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	28.7	28.5
Finite-lived Intangible assets, amortization amount	(27.7)	(27.4)
Finite-lived intangible assets, book value	1.0	1.1
Engineering drawings
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	10.2	10.0
Finite-lived Intangible assets, amortization amount	(10.1)	(9.9)
Finite-lived intangible assets, book value	0.1	0.1
Distribution network
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	18.2	18.0
Finite-lived Intangible assets, amortization amount	(0.1)	0.0
Finite-lived intangible assets, book value	18.1	18.0
Other intangibles
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	0.2	0.2
Finite-lived Intangible assets, amortization amount	(0.2)	(0.2)
Finite-lived intangible assets, book value	0.0	0.0
Trademarks and tradenames
Intangible asset balances by major asset class
Indefinite-lived intangible assets, book value	$ 93.3	$ 92.4

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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