Benefit Plans Benefit Plans - Summary of Benefit Plan (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016	Dec. 31, 2015
Change in accumulated other comprehensive income
Prior service cost occurring during the year		$ (0.4)		$ 0.0	$ 0.0
Net actuarial gains (losses) recognized due to curtailment		0.0		(1.5)	0.0
Acquired benefit plans and other		1.5		0.0	0.0
Pension Benefits
Change in plan assets
Employer contributions		5.7
Other Benefits
Change in benefit obligation
Benefit obligation at beginning of year		10.8		12.7
Service cost		0.0		0.0	0.0
Interest cost		0.4		0.5	0.6
Actuarial (gain) loss		(0.5)		(1.3)
Plan participant contributions		0.0		0.0
Benefits paid		(0.8)		(1.1)
Plan amendments		0.0		0.0
Special termination benefits		0.0		0.0
Curtailment		0.0		0.0
Settlements		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		9.9		10.8	12.7
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		1.1
Plan participant contributions		0.0		0.0
Benefits paid		(0.8)		(1.1)
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		(9.9)		(10.8)
Amounts recognized in balance sheets
Assets for Plan Benefits, Defined Benefit Plan		0.0		0.0
Current liabilities		1.1		1.1
Noncurrent liabilities	[1]	8.8		9.7
Unrecognized net actuarial loss	[2]	(0.5)		(1.1)
Unrecognized prior service cost (benefit)		0.0		0.0
Net amount recognized		9.4		9.7
Change in accumulated other comprehensive income
Balance at beginning of year		(1.1)		(2.6)
Prior service cost occurring during the year		0.0		0.0
Net actuarial losses recognized during the year		0.0		0.2
Net actuarial gains (losses) occurring during the year		0.6		1.3
Net actuarial gains (losses) recognized due to settlement		0.0		0.0
Net actuarial gains (losses) recognized due to curtailment		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		(0.5)		(1.1)	(2.6)
Foreign Plan [Member] | Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year		546.9		1.7
Service cost		10.5		5.5	0.1
Interest cost		5.7		2.7	0.0
Actuarial (gain) loss		7.5		(44.6)
Plan participant contributions		1.3		0.9
Benefits paid		(10.0)		(5.1)
Plan amendments		(0.8)		0.0
Special termination benefits		0.1		0.0
Curtailment		0.0		(4.6)
Settlements		191.4		0.0
Foreign currency impact		59.2		(34.7)
Acquired benefit plans and other		23.0		625.1
Benefit obligation at end of year		452.0		546.9	1.7
Change in plan assets
Fair value of plan assets at beginning of year		482.9		0.0
Actual return on plan assets		12.7		(12.3)
Employer contributions		1.3		5.3
Plan participant contributions		1.3		0.9
Benefits paid		(10.0)		(5.1)
Foreign currency impact		51.7		(30.1)
Acquired benefit plans and other		11.0		524.2
Settlements		(191.4)		0.0
Fair value of plan assets at end of year		359.5		482.9	0.0
Funded status		(92.5)		(64.0)
Amounts recognized in balance sheets
Assets for Plan Benefits, Defined Benefit Plan		6.9		15.7
Current liabilities		3.2		3.3
Noncurrent liabilities	[1]	96.2		76.4
Unrecognized net actuarial loss	[2]	27.7		27.8
Unrecognized prior service cost (benefit)		0.8	[2]	(0.1)
Net amount recognized		121.0		91.7
Change in accumulated other comprehensive income
Balance at beginning of year		27.7		(0.1)
Prior service cost occurring during the year		0.9		0.0
Net actuarial losses recognized during the year		(0.4)		0.0
Net actuarial gains (losses) occurring during the year		0.7		33.7
Net actuarial gains (losses) recognized due to settlement		(0.6)		0.0
Net actuarial gains (losses) recognized due to curtailment		0.0		(4.8)
Acquired benefit plans and other		(3.0)		0.0
Foreign currency impact		3.2		(1.1)
Balance at end of year		28.5		27.7	(0.1)
U.S. Plans | Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year		554.5		544.7
Service cost		3.9		3.5	3.6
Interest cost		22.9		24.7	23.8
Actuarial (gain) loss		(17.9)		(11.6)
Plan participant contributions		0.0		0.0
Benefits paid		(30.2)		(30.0)
Plan amendments		0.0		0.0
Special termination benefits		0.0		0.0
Curtailment		0.0		0.0
Settlements		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		569.0		554.5	544.7
Change in plan assets
Fair value of plan assets at beginning of year		351.7		347.9
Actual return on plan assets		53.6		30.4
Employer contributions		3.6		3.4
Plan participant contributions		0.0		0.0
Benefits paid		(30.2)		(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		378.7		351.7	347.9
Funded status		(190.3)		(202.8)
Amounts recognized in balance sheets
Assets for Plan Benefits, Defined Benefit Plan		0.3		0.0
Current liabilities		3.5		3.5
Noncurrent liabilities	[1]	187.1		199.3
Unrecognized net actuarial loss	[2]	154.4		170.1
Unrecognized prior service cost (benefit)	[2]	0.0		0.0
Net amount recognized		35.9		32.7
Change in accumulated other comprehensive income
Balance at beginning of year		(170.1)		(167.5)
Prior service cost occurring during the year		0.0		0.0
Net actuarial losses recognized during the year		5.9		5.6
Net actuarial gains (losses) occurring during the year		9.8		(8.2)
Net actuarial gains (losses) recognized due to settlement		0.0		0.0
Net actuarial gains (losses) recognized due to curtailment		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		$ (154.4)		$ (170.1)	$ (167.5)

[1] Included in the consolidated balance sheets in pensions and other benefits and other post-retirement benefits are international plans.

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