Benefit Plans and Other Postretirement Benefits, Other (Details) - Pension Benefits - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated other comprehensive income (loss), before tax
Net loss		$ 237.7	$ 265.7
Net prior service cost		7.7	10.5
Expected to be amortized from Accumulated other comprehensive loss over next fiscal year
Net loss that will be amortized from Accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year		23.4
Prior service cost that will be amortized from Accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year		2.3
Defined Benefit Plan, Contributions
Plan contributions by employer		22.5	22.2	$ 20.9
Estimated future employer contribution in next fiscal year		90.0
Expected benefits payments
2018		32.3
2019		32.9
2020		34.2
2021		37.0
2022		38.3
2023-2027		202.3
U.S.
Accumulated other comprehensive income (loss), before tax
Net loss		167.7	194.7
Net prior service cost		7.7	10.5
Defined Benefit Plan, Contributions
Plan contributions by employer	$ 80.0	16.5	16.4
Expected benefits payments
2018		24.8
2019		25.8
2020		26.9
2021		27.8
2022		28.9
2023-2027		151.2
International Plans
Accumulated other comprehensive income (loss), before tax
Net loss		70.0	71.0
Defined Benefit Plan, Contributions
Plan contributions by employer		6.0	5.8
Expected benefits payments
2018		7.5
2019		7.1
2020		7.3
2021		9.2
2022		9.4
2023-2027		51.1
Net liability
Net liability for foreign subsidiaries with benefits under local statutory plans		$ 16.6	$ 13.9