Goodwill and Other Intangible Assets - Gross carrying amount and accumulated amortization of the company's intangible assets other than goodwill (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Intangible asset balances by major asset class
Intangible assets, gross (excluding goodwill)	$ 165.5	$ 166.1
Finite-lived intangible assets, amortization amount	(48.0)	(48.0)
Intangible assets, book value	117.5	118.1
Customer Relationships
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	10.2	10.1
Finite-lived intangible assets, amortization amount	(8.5)	(8.4)
Finite-lived intangible assets, book value	1.7	1.7
Patents
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	29.7	29.8
Finite-lived intangible assets, amortization amount	(28.8)	(29.0)
Finite-lived intangible assets, book value	0.9	0.8
Engineering Drawings
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	10.5	10.5
Finite-lived intangible assets, amortization amount	(10.5)	(10.5)
Distribution Network
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	18.9	19.0
Finite-lived intangible assets, amortization amount	(0.1)	(0.1)
Finite-lived intangible assets, book value	18.8	18.9
Trademarks and Tradenames
Intangible asset balances by major asset class
Indefinite-lived intangible assets, book value	$ 96.2	$ 96.7

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