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Cost-Reduction Actions - Liabilities and Expected Future Payments Related to Work-Force Reduction Actions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring Reserve [Roll Forward]
Additional provisions	$ 5.1	$ 7.9	$ 13.6	$ 35.4
Work-force Reductions
Restructuring Reserve [Roll Forward]
Balance at beginning of period			55.9
Additional provisions			5.8
Payments			(22.1)
Changes in estimates			(7.7)
Translation adjustments			(0.9)
Balance at end of period	31.0		31.0
Short-term	26.3		26.3
Long-term	4.7		4.7
Work-force Reductions \| U.S.
Restructuring Reserve [Roll Forward]
Balance at beginning of period			13.1
Additional provisions			3.7
Payments			(9.4)
Changes in estimates			(0.4)
Translation adjustments			0.0
Balance at end of period	7.0		7.0
Short-term	7.0		7.0
Long-term	0.0		0.0
Work-force Reductions \| International
Restructuring Reserve [Roll Forward]
Balance at beginning of period			42.8
Additional provisions			2.1
Payments			(12.7)
Changes in estimates			(7.3)
Translation adjustments			(0.9)
Balance at end of period	24.0		24.0
Short-term	19.3		19.3
Long-term	$ 4.7		$ 4.7