Goodwill and Other Intangible Assets - Gross carrying amount and accumulated amortization of the company's intangible assets other than goodwill (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Intangible asset balances by major asset class
Intangible assets, gross (excluding goodwill)	$ 153.5	$ 155.5
Finite-lived intangible assets, amortization amount	(37.2)	(37.4)
Intangible assets, book value	116.3	118.1
Customer Relationships
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	10.0	10.1
Finite-lived intangible assets, amortization amount	(8.5)	(8.4)
Finite-lived intangible assets, book value	1.5	1.7
Patents
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	29.5	29.8
Finite-lived intangible assets, amortization amount	(28.7)	(29.0)
Finite-lived intangible assets, book value	0.8	0.8
Distribution Network
Intangible asset balances by major asset class
Finite-lived intangible assets, carrying amount	18.7	18.9
Finite-lived intangible assets, book value	18.7	18.9
Trademarks and Tradenames
Intangible asset balances by major asset class
Indefinite-lived intangible assets, book value	$ 95.3	$ 96.7