Benefit Plans (Changes in Projected Benefit Obligation, Fair Value of Plan Assets and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Fair Value of Plan Assets [Roll Forward]
Balance	$ 214.5
Employer contribution	(2.6)
Balance	244.1	$ 214.5
Pension Plan [Member]
Change in Benefit Obligation [Roll Forward]
Balance	(267.0)	(288.0)
Service cost	(1.4)	(10.8)	$ (10.4)
Interest cost	(9.2)	(9.4)	(9.8)
Participants’ contributions	(0.3)	(0.6)
Actuarial (loss) gain	(30.8)	20.4
Amendments/transfers in	0.0	(0.3)
Benefits/expenses paid	6.8	18.0
Foreign currency translation	(1.0)	3.7
Balance	(287.9)	(267.0)	(288.0)
Change in Fair Value of Plan Assets [Roll Forward]
Balance	214.5	239.5
Actual return on assets	41.3	(8.3)
Employer contribution	(8.0)	(2.7)
Participants’ contributions	0.3	0.6
Benefits/expenses paid	(6.3)	(18.0)
Foreign currency translation	1.3	(2.0)
Balance	244.1	214.5	239.5
Funded status at end of year	(43.8)	(52.5)
Other Postretirement Benefits Plan [Member]
Change in Benefit Obligation [Roll Forward]
Balance	(6.0)	(7.1)
Service cost	0.0	0.0	0.0
Interest cost	(0.2)	(0.2)	(0.3)
Participants’ contributions	(0.7)	(0.6)
Actuarial (loss) gain	(0.2)	1.4
Amendments/transfers in	0.0	0.0
Benefits/expenses paid	0.5	0.5
Foreign currency translation	0.0	0.0
Balance	(6.6)	(6.0)	(7.1)
Change in Fair Value of Plan Assets [Roll Forward]
Balance	0.0	0.0
Actual return on assets	0.0	0.0
Employer contribution	(0.2)	(0.1)
Participants’ contributions	0.7	0.6
Benefits/expenses paid	(0.5)	(0.5)
Foreign currency translation	0.0	0.0
Balance	0.0	0.0	$ 0.0
Funded status at end of year	$ (6.6)	$ (6.0)