Benefit Plans Benefit Plans - Summary of Benefit Plan (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in accumulated other comprehensive income
Acquired benefit plans and other		$ 3.0	$ 7.7	$ 1.5
Pension Benefits
Change in plan assets
Employer contributions		45.7
Change in accumulated other comprehensive income
Prior service credit/loss recognized during the year		0.5	0.0
Other Benefits
Change in benefit obligation
Benefit obligation at beginning of year		15.3	9.9
Service cost		0.1	0.0	0.0
Interest cost		1.0	0.4	0.4
Actuarial loss (gain)		1.8	(1.6)
Plan participant contributions		0.0	0.0
Benefits paid		(0.8)	(0.8)
Plan amendments		0.0	0.0
Settlements		0.0	0.0
Recognition/establishment of Germany benefit obligation		0.0	0.0	0.0
Foreign currency impact		(0.3)	0.0
Acquired benefit plans and other		0.0	7.4
Benefit obligation at end of year		17.1	15.3	9.9
Change in plan assets
Fair value of plan assets at beginning of year		0.0	0.0
Actual return on plan assets		0.0	0.0
Employer contributions		0.8	0.8
Plan participant contributions		0.0	0.0
Benefits paid		(0.8)	(0.8)
Foreign currency impact		0.0	0.0
Acquired benefit plans and other		0.0	0.0
Settlements		0.0	0.0
Fair value of plan assets at end of year		0.0	0.0	0.0
Funded status		(17.1)	(15.3)
Amounts recognized in balance sheets
Assets for Plan Benefits, Defined Benefit Plan		0.0	0.0
Current liabilities		1.0	1.1
Noncurrent liabilities	[1]	16.1	14.2
Unrecognized net actuarial loss	[2]	(7.4)	(6.3)
Unrecognized prior service cost (benefit)	[2]	0.0	0.0
Net amount recognized		9.7	9.0
Change in accumulated other comprehensive income
Balance at beginning of year		(6.3)	(0.5)
Prior service credit/loss recognized during the year		0.0	0.0
Net actuarial gains (losses) recognized during the year		0.4	0.0
Net actuarial (losses) gains occurring during the year		(1.9)	1.6
Net actuarial losses recognized due to settlement		0.0	0.0
Acquired benefit plans and other		0.0	(7.4)
Foreign currency impact		0.3	0.0
Balance at end of year		(7.5)	(6.3)	(0.5)
United States | Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year		522.2	569.0
Service cost		3.7	3.9	3.9
Interest cost		22.1	20.6	22.9
Actuarial loss (gain)		(62.5)	41.3
Plan participant contributions		0.0	0.0
Benefits paid		(30.5)	(30.0)
Plan amendments		0.0	0.0
Settlements		0.0	0.0
Recognition/establishment of Germany benefit obligation		0.0	0.0	0.0
Foreign currency impact		0.0	0.0
Acquired benefit plans and other		0.0	0.0
Benefit obligation at end of year		580.0	522.2	569.0
Change in plan assets
Fair value of plan assets at beginning of year		346.0	378.7
Actual return on plan assets		74.1	(20.3)
Employer contributions		38.1	17.6
Plan participant contributions		0.0	0.0
Benefits paid		(30.4)	(30.0)
Foreign currency impact		0.0	0.0
Acquired benefit plans and other		0.0	0.0
Settlements		0.0	0.0
Fair value of plan assets at end of year		427.8	346.0	378.7
Funded status		(152.2)	(176.2)
Amounts recognized in balance sheets
Assets for Plan Benefits, Defined Benefit Plan		1.4	0.0
Current liabilities		3.5	3.4
Noncurrent liabilities	[1]	150.1	172.7
Unrecognized net actuarial loss	[2]	159.2	151.3
Unrecognized prior service cost (benefit)	[2]	0.0	0.0
Net amount recognized		(7.0)	24.8
Change in accumulated other comprehensive income
Balance at beginning of year		(151.4)	(154.4)
Prior service credit/loss recognized during the year		0.0	0.0
Net actuarial gains (losses) recognized during the year		5.1	6.6
Net actuarial (losses) gains occurring during the year		(13.1)	(3.6)
Net actuarial losses recognized due to settlement		0.0	0.0
Acquired benefit plans and other		0.0	0.0
Foreign currency impact		0.0	0.0
Balance at end of year		(159.4)	(151.4)	(154.4)
Foreign Plan [Member] | Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year		426.5	452.0
Service cost		9.8	11.0	10.5
Interest cost		6.5	6.2	5.7
Actuarial loss (gain)		32.7	(3.5)
Plan participant contributions		1.3	1.4
Benefits paid		(17.5)	(17.3)
Plan amendments		0.4	0.0
Settlements		(5.8)	(7.7)
Recognition/establishment of Germany benefit obligation		7.1	0.0	0.0
Foreign currency impact		(3.4)	(18.1)
Acquired benefit plans and other		(1.5)	2.5
Benefit obligation at end of year		456.1	426.5	452.0
Change in plan assets
Fair value of plan assets at beginning of year		340.9	359.5
Actual return on plan assets		37.3	2.2
Employer contributions		6.8	16.9
Plan participant contributions		1.3	1.4
Benefits paid		(17.5)	(17.3)
Foreign currency impact		(3.3)	(14.4)
Acquired benefit plans and other		0.3	0.3
Settlements		(5.8)	(7.7)
Fair value of plan assets at end of year		360.0	340.9	359.5
Funded status		(96.1)	(85.6)
Amounts recognized in balance sheets
Assets for Plan Benefits, Defined Benefit Plan		139.3	0.0
Current liabilities		8.2	3.2
Noncurrent liabilities	[1]	227.6	82.4
Unrecognized net actuarial loss	[2]	6.2	19.0
Unrecognized prior service cost (benefit)	[2]	(0.3)	0.7
Net amount recognized		102.4	105.3
Change in accumulated other comprehensive income
Balance at beginning of year		19.8	28.5
Net actuarial gains (losses) recognized during the year		(1.5)	(0.7)
Net actuarial (losses) gains occurring during the year		(7.7)	(4.9)
Net actuarial losses recognized due to settlement		(0.9)	(2.2)
Acquired benefit plans and other		(2.6)	(0.3)
Foreign currency impact		(0.1)	(0.6)
Balance at end of year		$ 6.5	$ 19.8	$ 28.5

[1] Included in the consolidated balance sheets in pensions, post-retirement and other benefits

[2] Represents amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost.