Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Goodwill, Gross
Balance, beginning of period	$ 235.1
Purchase accounting adjustments	0.0
Foreign currency fluctuations	(6.1)
Balance, end of period	229.0		$ 235.1
Accumulated Impairment Losses
Balance, beginning of period	(40.0)
Foreign currency fluctuations	2.2
Balance, end of period	(37.8)		(40.0)
Goodwill, Net
Balance, beginning of period	195.1
Purchase accounting adjustments	0.0
Foreign currency fluctuations	(3.9)
Balance, end of period	191.2		195.1
Acquired Finite-lived Intangible Assets
Original cost	198.7		203.0
Accumulated amortization	(69.1)		(65.3)
Carrying value	129.6		137.7
Purchase of Intangible Assets	0.1	$ 0.2
Amortization expense	5.0	$ 5.7
Estimated aggregate amortization expense of Intangible Assets
Remaining 2019	14.9
2020	18.6
2021	16.6
2022	15.1
2023	13.6
Thereafter	50.8
Total	129.6
Gaomei
Acquired Finite-lived Intangible Assets
Purchase of Intangible Assets	15.7
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	150.7		154.1
Accumulated amortization	(52.5)		(49.8)
Carrying value	$ 98.2		$ 104.3
Weighted-average original life (in years)	15 years		15 years
Trade Names
Acquired Finite-lived Intangible Assets
Original cost	$ 31.3		$ 31.8
Accumulated amortization	(8.9)		(8.2)
Carrying value	$ 22.4		$ 23.6
Weighted-average original life (in years)	11 years		11 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	$ 16.7		$ 17.1
Accumulated amortization	(7.7)		(7.3)
Carrying value	$ 9.0		$ 9.8
Weighted-average original life (in years)	11 years		11 years