Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill, Gross
Balance, beginning of period	$ 221.7	$ 227.2
Additions		0.0
Purchase accounting adjustments	15.6	4.6
Foreign currency fluctuations	(2.2)	(10.1)
Balance, end of period	235.1	221.7	$ 227.2
Accumulated Impairment Losses
Balance, beginning of period	(39.0)	(41.2)
Foreign currency fluctuations	1.0	2.2
Balance, end of period	(40.0)	(39.0)	(41.2)
Goodwill, Net
Balance, beginning of period	182.7	186.0
Additions		0.0
Purchase accounting adjustments	15.6	4.6
Foreign currency fluctuations	(3.2)	(7.9)
Balance, end of period	195.1	182.7	186.0
Acquired Finite-lived Intangible Assets
Original cost	203.0	191.1
Accumulated amortization	(65.3)	(44.6)
Intangible Assets, Net	137.7	146.5
Payments to Acquire Intangible Assets	0.5	2.8	2.5
Amortization of Intangible Assets	22.2	22.1	$ 17.1
Estimated aggregate amortization expense of Intangible Assets
2020	20.6
2021	19.0
2022	16.9
2023	15.4
2024	13.9
Thereafter	51.9
Total	137.7
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	154.1	143.1
Accumulated amortization	(49.8)	(33.8)
Intangible Assets, Net	$ 104.3	$ 109.3
Weighted-average original life (in years)	15 years	15 years
Trade Name
Acquired Finite-lived Intangible Assets
Original cost	$ 31.8	$ 30.6
Accumulated amortization	(8.2)	(5.3)
Intangible Assets, Net	$ 23.6	$ 25.3
Weighted-average original life (in years)	11 years	10 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	$ 17.1	$ 17.4
Accumulated amortization	(7.3)	(5.5)
Intangible Assets, Net	$ 9.8	$ 11.9
Weighted-average original life (in years)	11 years	10 years
Gaomei [Member]
Acquired Finite-lived Intangible Assets
Payments to Acquire Intangible Assets	$ 15.7