Revenue Recognition - Contract Liabilities (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 29, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Contract with Customer, Asset
Contract Assets	$ 0.4	$ 0.1	$ 0.1	$ 0.3	$ 1.0	$ 1.8	$ 1.4	$ 1.7	$ 0.4	$ 1.0	$ 0.6
Change in period	0.3		(0.2)	(0.7)	(0.8)	0.4	(0.3)	1.1
Contract Liabilities
Contract Liabilities - Current	11.5	11.8	12.1	11.4	11.3	11.2	11.6	11.5	11.5	11.3	11.3
Increase (decrease) - Current Liabilities	(0.3)	(0.3)	0.7	0.1	0.1	(0.4)	0.1	0.2
Contract Liabilities - Noncurrent	2.9	3.0	2.8	$ 2.7	$ 2.7	$ 2.7	2.7	2.4	2.9	2.7	$ 2.1
Increase (decrease) - Noncurrent Liabilities	$ (0.1)	$ 0.2	$ 0.1				$ 0.3	$ 0.3
Revenue recognized, contract liability									11.8	11.3
Impairment loss related to Contract Assets									$ 0.0	$ 0.0
Revenue practical expedient, incremental cost of obtaining contract									true