Benefit Plans and Other Postretirement Benefits (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in plan assets:
Employer contributions	$ 23.8	$ 23.3
Pension Benefits
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	560.1	565.4
Service cost	10.8	10.5
Interest cost	24.1	20.9	22.0
Acquisitions	7.0	16.4
Plan amendments		5.6
Actuarial (gain) loss	123.1	(33.7)
Foreign exchange translation	(18.7)	2.6
Benefits paid	(29.9)	(27.6)
Projected benefit obligation at end of year	676.5	560.1	565.4
Change in plan assets:
Fair value of plan assets at the beginning of the year	392.5	334.4
Actual return on plan assets	26.4	50.7
Employer contributions	23.8	23.3	21.8
Acquisitions		12.3
Foreign exchange translation	(4.7)	(0.6)
Actuarial loss	1.3
Benefits paid	(29.9)	(27.6)
Fair value of plan assets at the end of the year	409.4	392.5	334.4
Funded status	(267.1)	(167.6)
Accumulated benefit obligation	653.7	539.4
Components of net post-retirement benefit cost:
Service cost	8.2	8.5	7.7
Interest cost	24.1	20.9	22.0
Expected return on plan assets	(28.5)	(24.8)	(25.0)
Amortization of net actuarial losses	18.6	25.5	20.5
Net pension expense	22.4	30.1	25.2
International Plans
Change in projected benefit obligation:
Projected benefit obligation at end of year	86.0	74.0
Contribution required to be made during 2015, included in other accrued expenses	5.0
Other Postretirement Benefits
Change in projected benefit obligation:
Projected benefit obligation at beginning of year	11.9	15.7
Service cost	0.1	0.2
Interest cost	0.5	0.5	0.7
Actuarial (gain) loss	0.6	(3.4)
Benefits paid	(0.9)	(1.1)
Projected benefit obligation at end of year	12.2	11.9	15.7
Components of net post-retirement benefit cost:
Service cost	0.1	0.2	0.2
Interest cost	0.5	0.5	0.7
Amortization of net actuarial losses	0.4	0.8	1.0
Net pension expense	$ 1.0	$ 1.5	$ 1.9