Employee Benefit Plans (Plans' Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Changes in plan assets:
Fair value of plan assets at beginning of year	$ 318.6
Fair value of plan assets at end of year	291.0	$ 318.6
Pension Benefits [Member]
Pension and Postretirement Benefit Plans recognized in financial statements
Accumulated benefit obligation	368.0	401.5
Changes in projected benefit obligation:
Benefit obligation at beginning of year	405.5	381.6
Service cost	5.3	5.0	$ 4.4
Interest cost	12.3	12.6	15.3
Other	0.3	0.0
Actuarial (gain) loss	(26.4)	22.1
Effect of exchange rates	(2.7)	4.3
Settlements and curtailments	(1.3)	(1.3)
Benefits paid	(21.1)	(18.8)
Benefit obligation at end of year	371.9	405.5	381.6
Changes in plan assets:
Fair value of plan assets at beginning of year	318.6	292.5
Actual gain return on plan assets	(23.3)	39.8
Employer contribution	20.6	3.5
Effect of exchange rates	(2.5)	2.9
Plan settlements	(1.3)	(1.3)
Benefits paid	(21.1)	(18.8)
Fair value of plan assets at end of year	291.0	318.6	$ 292.5
Funded status / net amount recognized	(80.9)	(86.9)
Net amount recognized consists of:
Non-current assets	3.3	1.6
Current liability	(1.4)	(4.0)
Non-current liability	(82.8)	(84.5)
Net amount recognized	$ (80.9)	$ (86.9)