Stockholders' Equity - Reclassifications from Accumulated Other Comprehensive Loss (Details) - Amount Reclassified from Accumulated Other Comprehensive Loss - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[1]	$ (0.9)		$ (1.6)		$ (2.4)		$ (4.6)
Reclassification from AOCI, Current Period, Tax	[1],[2]	(0.3)		(0.6)		(0.8)		(1.6)
Total reclassifications for the period, net of tax	[1]	(0.6)		(1.0)		(1.6)		(3.0)
Other (income) expense, net
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	[1],[2]					0.0		0.1
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	[1],[2]	$ (0.9)	[3]	$ (1.6)	[3]	$ (2.4)	[4]	$ (4.7)	[4]

[1] Amounts in parentheses indicate debits to profit/loss.

[2] Continuing operations only.

[3] The actuarial loss components of Accumulated other comprehensive loss are included in the computation of net periodic pension cost for the three months ended September 30, 2017 and 2016, as disclosed in Note 7 – Pensions.

[4] The actuarial loss components of Accumulated other comprehensive loss are included in the computation of net periodic pension cost for the nine months ended September 30, 2017 and 2016, as disclosed in Note 7 – Pensions.