Pension and Other Post-Retirement Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Special Termination Benefits		$ 9.0
Change in Fair Value of Plan Assets
Plan assets at beginning of year	$ 416.1
Company contributions	1.8	1.9	$ 1.8
Plan assets at end of year	413.5	416.1
Amount Recognized
Other liabilities	(82.3)	(94.6)
Accumulative other comprehensive loss:
After-tax amount recognized in accumulated other comprehensive loss	87.1	99.9	107.7	$ 78.2
Defined Benefit Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Special Termination Benefits	0.0	(7.3)
Change in Benefit Obligation
Benefit obligation at beginning of year	475.0	502.7
Service cost	6.1	7.4	5.9
Interest cost	15.3	19.6	20.7
Actuarial loss	(18.3)	22.6
Benefits paid	(44.5)	(36.9)
Effect of foreign exchange rate changes	(5.8)	(2.5)
Benefit obligation at end of year	464.4	475.0	502.7
Change in Fair Value of Plan Assets
Plan assets at beginning of year	416.1	456.9
Actual return on plan assets	45.8	(4.6)
Effect of exchange rate changes	(6.1)	(2.2)
Company contributions	2.2	2.9
Benefits paid	(44.5)	(36.9)
Plan assets at end of year	413.5	416.1	456.9
Funded Status at end of year	(50.9)	(58.9)
Amount Recognized
Other liabilities	(50.9)	(58.9)
Accumulative other comprehensive loss:
Net actuarial loss	144.1	163.3
Prior service credit (cost)	(0.1)	(1.1)
Accumulated other comprehensive loss	144.0	162.2
After-tax amount recognized in accumulated other comprehensive loss	90.0	101.3
Retiree Health and Life [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Special Termination Benefits	0.0	(1.7)
Change in Benefit Obligation
Benefit obligation at beginning of year	35.0	40.8
Service cost	0.2	0.2	0.1
Interest cost	0.9	1.3	1.6
Actuarial loss	3.0	3.6
Benefits paid	(2.8)	(2.9)
Effect of foreign exchange rate changes	0.0	0.0
Benefit obligation at end of year	30.3	35.0	40.8
Change in Fair Value of Plan Assets
Plan assets at beginning of year	0.0	0.0
Actual return on plan assets	0.0	0.0
Effect of exchange rate changes	0.0	0.0
Company contributions	2.8	2.9
Benefits paid	(2.8)	(2.9)
Plan assets at end of year	0.0	0.0	$ 0.0
Funded Status at end of year	(30.3)	(35.0)
Amount Recognized
Other liabilities	(30.3)	(35.0)
Accumulative other comprehensive loss:
Net actuarial loss	(2.9)	(0.2)
Prior service credit (cost)	(1.8)	(2.0)
Accumulated other comprehensive loss	(4.7)	(2.2)
After-tax amount recognized in accumulated other comprehensive loss	$ (2.9)	$ (1.4)