Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Goodwill, Gross
Balance, beginning of period			$ 235.1
Purchase accounting adjustments			0.0
Foreign currency fluctuations			5.8
Balance, end of period	$ 240.9		240.9		$ 235.1
Goodwill, Impairment Loss			0.0
Accumulated Impairment Losses
Balance, beginning of period			(40.0)
Foreign currency fluctuations			0.5
Balance, end of period	(39.5)		(39.5)		(40.0)
Goodwill, Net
Balance, beginning of period			195.1
Purchase accounting adjustments			0.0
Foreign currency fluctuations			6.3
Balance, end of period	201.4		201.4		195.1
Acquired Finite-lived Intangible Assets
Original cost	209.9		209.9		203.0
Accumulated amortization	(83.3)		(83.3)		(65.3)
Carrying value	126.6		126.6		137.7
Purchase of Intangible Assets			0.1	$ 0.5
Amortization expense	5.3	$ 5.1	15.3	$ 16.6
Estimated aggregate amortization expense of Intangible Assets
Remaining 2019	5.3		5.3
2020	19.7		19.7
2021	17.5		17.5
2022	16.0		16.0
2023	14.4		14.4
Thereafter	53.7		53.7
Total	126.6		126.6
Customer Lists
Acquired Finite-lived Intangible Assets
Original cost	159.4		159.4		154.1
Accumulated amortization	(63.3)		(63.3)		(49.8)
Carrying value	96.1		$ 96.1		$ 104.3
Weighted-average original life (in years)			15 years		15 years
Trade Names
Acquired Finite-lived Intangible Assets
Original cost	33.1		$ 33.1		$ 31.8
Accumulated amortization	(11.0)		(11.0)		(8.2)
Carrying value	22.1		$ 22.1		$ 23.6
Weighted-average original life (in years)			11 years		11 years
Technology
Acquired Finite-lived Intangible Assets
Original cost	17.4		$ 17.4		$ 17.1
Accumulated amortization	(9.0)		(9.0)		(7.3)
Carrying value	$ 8.4		$ 8.4		$ 9.8
Weighted-average original life (in years)			11 years		11 years