Employee Benefit Plans (Changes in Projected Benefit Obligations, Plan Assets and Funded Status) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Projected benefit obligation, beginning of year
Service cost			$ 0.6
Interest cost			1.5
Change in Plan Assets
Fair value of plan assets, beginning of year	$ 315.7
Fair value of plan assets, end of year	1,354.6	$ 315.7
Pension Benefits
Projected benefit obligation, beginning of year
Projected benefit obligation, beginning of year	674.7	635.4
Service cost	23.5	20.7	19.2
Interest cost	13.5	13.6	13.0
Participant contributions	1.8	1.0
Acquisitions	1,389.4	0.8
Plan settlements and terminations	(23.1)	(23.8)
Actuarial losses (gains)	37.2	57.3
Benefits paid	(24.6)	(23.9)
Impact of foreign currency translation	53.4	(6.4)
Projected benefit obligation, end of year	2,145.8	674.7	635.4
Change in Plan Assets
Fair value of plan assets, beginning of year	315.7	283.5
Actual return on plan assets	46.0	39.2
Company contributions	58.2	26.4
Participant contributions	1.8	1.0
Defined Benefit Plan, Plan Assets, Business Combination	959.3	0.0
Plan settlements	(23.1)	(8.9)
Other	0.0	(1.9)
Impact of foreign currency translation	21.3	0.3
Fair value of plan assets, end of year	1,354.6	315.7	283.5
Funded status of plans	(791.2)	(359.0)
Other Postretirement Benefits
Projected benefit obligation, beginning of year
Projected benefit obligation, beginning of year	33.8	34.0
Service cost	1.1	0.6
Interest cost	1.4	1.5
Participant contributions	0.1	0.2
Acquisitions	153.1	0.0
Plan settlements and terminations	(0.2)	(7.1)
Actuarial losses (gains)	1.1	7.1
Benefits paid	(1.6)	(2.5)
Impact of foreign currency translation	0.0	0.0
Projected benefit obligation, end of year	188.8	33.8	34.0
Change in Plan Assets
Fair value of plan assets, beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Company contributions	1.7	9.4
Participant contributions	0.1	0.2
Defined Benefit Plan, Plan Assets, Business Combination	0.0	0.0
Plan settlements	(0.2)	(7.1)
Other	0.0	0.0
Impact of foreign currency translation	0.0	0.0
Fair value of plan assets, end of year	0.0	0.0	$ 0.0
Funded status of plans	$ (188.8)	$ (33.8)