Retirement Benefits Change in Benefit Obligations and Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits
Change in benefit obligation
Benefit obligation at beginning of year	$ 912.3	$ 976.3
Service cost	12.9	17.7	$ 15.1
Interest cost	41.9	40.5	40.9
Plan participants’ contributions	0.5	0.7
Amendments	(34.1)	0.0
Actuarial loss (gain)	88.0	(46.6)
Currency impact	(18.5)	(6.7)
Other	(0.5)	(1.4)
Benefits paid	(85.1)	(68.2)
Benefit obligation at end of year	917.4	912.3	976.3
Change in plan assets
Fair value of plan assets at beginning of year	757.6	835.7
Actual return on plan assets	23.6	(31.8)
Employer contributions	24.3	27.9
Plan participants’ contributions	0.5	0.7
Currency impact	(15.8)	(6.7)
Benefits paid	(85.1)	(68.2)
Fair value of plan assets at end of year	705.1	757.6	835.7
FUNDED STATUS	(212.3)	(154.7)
Prepaid pensions (included in Other long-term assets)	1.7	1.4
Accrued benefit liability (short-term and long-term)	(214.0)	(156.1)
NET AMOUNT RECOGNIZED IN THE CONSOLIDATED BALANCE SHEET	(212.3)	(154.7)
Amounts recognized in Accumulated other comprehensive loss (income) consist of:
Net actuarial loss	274.2	221.5
Prior service cost (credit)	0.4	0.6
NET AMOUNT RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS	274.6	222.1
Other Benefits
Change in benefit obligation
Benefit obligation at beginning of year	26.6	26.7
Service cost	0.0	0.1	0.1
Interest cost	1.2	1.0	1.1
Plan participants’ contributions	0.0	0.0
Amendments	0.0	0.0
Actuarial loss (gain)	0.2	0.5
Currency impact		0.0
Other	0.0	(0.1)
Benefits paid	(1.8)	(1.6)
Benefit obligation at end of year	26.2	26.6	$ 26.7
Change in plan assets
Employer contributions	1.8	1.6
Plan participants’ contributions	0.0	0.0
Benefits paid	(1.8)	(1.6)
FUNDED STATUS	(26.2)	(26.6)
Accrued benefit liability (short-term and long-term)	(26.2)	(26.6)
NET AMOUNT RECOGNIZED IN THE CONSOLIDATED BALANCE SHEET	(26.2)	(26.6)
Amounts recognized in Accumulated other comprehensive loss (income) consist of:
Net actuarial loss	1.7	1.4
Prior service cost (credit)	(3.3)	(4.2)
NET AMOUNT RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS	$ (1.6)	$ (2.8)