Retirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 2.0	$ 2.2	$ 6.1	$ 6.6
Interest cost	3.3	3.1	10.0	9.2
Expected return on assets	(3.3)	(2.8)	(10.1)	(8.4)
Curtailment gain	0	0	0	(2.3)
Other	1.0	1.1	3.0	2.9
Total benefit cost	3.0	3.6	9.0	8.0
Contributions to pension plans	5.0		11.2
Estimated employer contribution to pension plans during current fiscal year			13.0
Retiree Health Care Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0.1	0	0.1
Interest cost	0.2	0.3	0.6	0.9
Net loss	0.1	0	0.1	0.2
Total benefit cost	0.3	0.4	0.7	1.2
Contributions to retiree health care plan	$ 0.3		$ 1.2