Pension Plans Funded Status of Non-U.S. Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
United States Pension Plan of US Entity [Member]
Change in pension benefit obligation:
Benefit obligation at beginning of year	$ 0.0
Service cost	0.0
Interest cost	0.3
Employee contributions	0.0
Benefits paid and other	(0.2)
Plan combinations/acquisitions	33.1
Actuarial loss (gain)	0.5
Amendments, settlements and curtailments	0.0
Foreign exchange rate impact	0.0
Benefit obligation at end of year	33.7	$ 0.0
Change in plan assets:
Fair value of plan assets at beginning of year	0.0
Actual return on plan assets	0.5
Employer contributions	0.0
Employee contributions	0.0
Amendments and settlements	0.0
Benefits paid and other	(0.2)
Plan combinations/acquisitions	25.5
Foreign exchange rate impact	0.0
Fair value of plan assets at end of year	25.8	0.0
Funded status	(7.9)
Foreign Pension Plan [Member]
Change in pension benefit obligation:
Benefit obligation at beginning of year	335.4	326.9
Service cost	4.0	3.5
Interest cost	5.9	7.4
Employee contributions	1.5	1.5
Benefits paid and other	(11.1)	(12.8)
Plan combinations/acquisitions	1.5	2.8
Actuarial loss (gain)	(10.7)	32.2
Amendments, settlements and curtailments	(17.6)	(1.6)
Foreign exchange rate impact	36.0	(24.5)
Benefit obligation at end of year	344.9	335.4
Change in plan assets:
Fair value of plan assets at beginning of year	198.1	196.7
Actual return on plan assets	(9.4)	17.9
Employer contributions	10.6	10.7
Employee contributions	1.5	1.5
Amendments and settlements	(5.1)	(0.5)
Benefits paid and other	(11.1)	(12.8)
Plan combinations/acquisitions	0.9	1.8
Foreign exchange rate impact	19.7	(17.2)
Fair value of plan assets at end of year	205.2	198.1
Funded status	$ (139.7)	$ (137.3)