Retirement Benefits Components of Pension and Other Benefit Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	$ 12.9	$ 17.7	$ 15.1
Interest cost	41.9	40.5	40.9
Expected return on plan assets	(44.3)	(53.2)	(45.2)
Amortization of prior service cost (credit)	0.1	0.2	0.2
Amortization of actuarial losses (gains)	13.9	12.1	3.9
Other	0.0	0.0	0.0
Curtailment and settlement losses (gains)	0.2	0.0	0.0
Net periodic benefit cost (credit)	24.7	17.3	14.9
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax [Abstract]
Current year net actuarial loss (gain)	72.0	37.0	93.1
Current year prior service credit	0.0	0.0	0.0
Amortization of prior service (cost) credit	(0.1)	(0.2)	(0.2)
Amortization of net actuarial (losses) gains	(13.9)	(12.1)	(3.9)
Currency impact	(4.0)	(0.1)	0.0
Other adjustments	(0.2)	0.0	0.0
Total recognized in other comprehensive loss (income)	53.8	24.6	89.0
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax	78.5	41.9	103.9
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Amortization of prior service cost (credit)	0.1
Amortization of net loss (gain)	11.0
TOTAL EXPECTED TO BE RECOGNIZED THROUGH INCOME DURING NEXT FISCAL YEAR	11.1
Other Benefits
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0.0	0.1	0.1
Interest cost	1.2	1.0	1.1
Expected return on plan assets		0.0	0.0
Amortization of prior service cost (credit)	(1.0)	(1.0)	(1.0)
Amortization of actuarial losses (gains)	0.0	(0.1)	(0.1)
Other	0.0	0.0	(2.2)
Curtailment and settlement losses (gains)	0.0	0.0	0.0
Net periodic benefit cost (credit)	0.2	0.0	(2.1)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Reclassification Adjustments, Net of Tax [Abstract]
Current year net actuarial loss (gain)	0.2	0.5	1.5
Current year prior service credit		0.0	0.0
Amortization of prior service (cost) credit	1.0	1.0	1.0
Amortization of net actuarial (losses) gains	0.0	0.1	0.1
Currency impact	0.0	0.0	0.0
Other adjustments	0.0	0.0	0.0
Total recognized in other comprehensive loss (income)	1.2	1.6	2.6
Amount Recognized in Net Periodic Benefit Cost and Other Comprehensive Income (Loss), before Tax	1.4	$ 1.6	$ 0.5
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year [Abstract]
Amortization of prior service cost (credit)	(1.0)
Amortization of net loss (gain)	0.0
TOTAL EXPECTED TO BE RECOGNIZED THROUGH INCOME DURING NEXT FISCAL YEAR	$ (1.0)