Other Expense Restructuring and Related Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and related charges		$ 0.6
Restructuring Reserve [Roll Forward]
Non-cash asset-write-downs	$ 0.0	(0.3)
Severance and benefits [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2019	1.4
Cash payments	(0.6)
Balance, March 31, 2020	0.8
Asset-related charges [Member]
Restructuring Reserve [Roll Forward]
Cash payments	0.0
Other charges [Member]
Restructuring Reserve [Roll Forward]
Cash payments	0.0
2018 Restructuring Plan [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring and related cost, expected cost			$ 16.0
Restructuring and related cost, cumulative cost incurred			$ 13.7
Severance charges	0.0	0.3
Other charges	0.0	0.3
Restructuring and related charges	0.0
Restructuring Reserve [Roll Forward]
Balance, December 31, 2019	1.4
Charges		$ 0.6
Cash payments	(0.6)
Balance, March 31, 2020	0.8
2018 Restructuring Plan [Member] | Asset-related charges [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2019	0.0
Balance, March 31, 2020	0.0
2018 Restructuring Plan [Member] | Other charges [Member]
Restructuring Reserve [Roll Forward]
Balance, December 31, 2019	0.0
Balance, March 31, 2020	$ 0.0