Operations and Summary of Significant Accounting Policies - Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income, net of reclassification adjustments	$ (37.3)	$ (198.0)	$ 81.2
AOCI Attributable To Parent
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	(39.6)	(194.2)	84.9
Other comprehensive income (loss), income taxes	(0.2)	0.4	(4.9)
Other comprehensive (loss) income, net of reclassification adjustments	(39.8)	(193.8)	80.0
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	(13.4)	0.8	24.2
Other comprehensive income (loss), income taxes	(0.6)	1.9	(4.8)
Other comprehensive (loss) income, net of reclassification adjustments	(14.0)	2.7	19.4
Net gain on derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	(3.1)	7.6	4.1
Other comprehensive income (loss), income taxes	0.4	(1.5)	(0.1)
Other comprehensive (loss) income, net of reclassification adjustments	(2.7)	6.1	4.0
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss), before tax	(23.1)	(202.6)	56.6
Other comprehensive income (loss), income taxes	0.0	0.0	0.0
Other comprehensive (loss) income, net of reclassification adjustments	(23.1)	(202.6)	56.6
AOCI Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income, net of reclassification adjustments	2.5	(4.2)	1.2
Defined benefit pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income, net of reclassification adjustments	0.0	0.0	0.0
Net gain on derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income, net of reclassification adjustments	0.0	0.0	0.0
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income, net of reclassification adjustments	$ 2.5	$ (4.2)	$ 1.2