Pensions (Schedule of Company's Pension Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other noncurrent assets	$ 196.7	$ 177.3
Liabilities held for sale	7.2	0.0
U.S.
Service cost	6.7	6.5	$ 6.8
Interest cost	9.6	11.7	10.5
Fair value at beginning of year	301.5
Fair value at end of year	333.0	301.5
Non-US
Service cost	1.7	1.7	1.7
Interest cost	6.6	8.8	8.4
Fair value at beginning of year	409.0
Fair value at end of year	463.9	409.0
Pension Plans | U.S.
Benefit obligation at beginning of year	341.0	293.3
Service cost	6.7	6.5
Interest cost	9.6	11.7
Employee contributions	0.0	0.0
Amendments	0.0	0.0
Actuarial losses (gains)	22.5	42.2
Benefits paid	(19.0)	(13.0)
Foreign exchange rate changes	0.0	0.0
Curtailments and settlements	0.0	0.0
Other, including expenses paid	0.6	0.3
Benefit obligation at end of year	361.4	341.0	293.3
Fair value at beginning of year	301.5	259.4
Actual return on plan assets	45.2	50.4
Company contributions	6.3	6.0	6.1
Employee contributions	0.0	0.0
Benefits paid	(19.0)	(13.0)
Foreign exchange rate changes	0.0	0.0
Curtailments and settlements	0.0	0.0
Other, including expenses paid	(1.0)	(1.3)
Fair value at end of year	333.0	301.5	259.4
Other noncurrent assets	0.0	0.0
Accrued compensation and benefits	(0.2)	(0.5)
Postemployment and other benefit liabilities	(28.2)	(39.0)
Liabilities held for sale	0.0	0.0
Funded (Unfunded) Status of Plan	(28.4)	(39.5)
Pension Plans | Non-US
Benefit obligation at beginning of year	404.5	356.8
Service cost	1.7	1.7
Interest cost	6.6	8.8
Employee contributions	0.3	0.3
Amendments	0.2	(0.8)
Actuarial losses (gains)	43.4	45.7
Benefits paid	(16.3)	(16.9)
Foreign exchange rate changes	15.9	13.9
Curtailments and settlements	(0.6)	(5.0)
Other, including expenses paid	0.0	0.0
Benefit obligation at end of year	455.7	404.5	356.8
Fair value at beginning of year	409.0	352.2
Actual return on plan assets	52.1	55.2
Company contributions	5.1	10.6	5.4
Employee contributions	0.3	0.3
Benefits paid	(16.3)	(16.9)
Foreign exchange rate changes	15.9	15.2
Curtailments and settlements	0.6	6.2
Other, including expenses paid	(1.6)	(1.4)
Fair value at end of year	463.9	409.0	$ 352.2
Other noncurrent assets	37.4	29.3
Accrued compensation and benefits	(0.8)	(0.8)
Postemployment and other benefit liabilities	(27.6)	(24.0)
Liabilities held for sale	0.8	0.0
Funded (Unfunded) Status of Plan	$ 8.2	$ 4.5