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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Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross carrying amount	$ 126.6		$ 126.6		$ 92.1
Accumulated amortization	56.3		56.3		49.1
Unamortized intangible assets, gross carrying amount	35.7		35.7		35.7
Intangible assets, net	106.0		106.0		78.7
Amortization expense	3.9	$ 3.2	7.2	$ 6.5
2021	8.6		8.6
2022	11.8		11.8
2023	11.2		11.2
2024	11.2		11.2
2025	10.8		10.8
Trademarks
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	32.0		32.0		32.0
In Process Research and Development [Member]
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	3.7		3.7		3.7
Trademarks
Finite-Lived Intangible Assets
Gross carrying amount	2.0		2.0		1.0
Accumulated amortization	0.4		0.4		0.4
Patents
Finite-Lived Intangible Assets
Gross carrying amount	40.8		40.8		40.8
Accumulated amortization	38.4		38.4		36.1
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	39.7		39.7		12.0
Accumulated amortization	6.7		6.7		5.2
200000
Finite-Lived Intangible Assets
Gross carrying amount	41.7		41.7		36.5
Accumulated amortization	9.8		9.8		6.7
Other
Finite-Lived Intangible Assets
Gross carrying amount	2.4		2.4		1.8
Accumulated amortization	$ 1.0		$ 1.0		$ 0.7