Benefit Plans and Other Postretirement Benefits, Other (Details) - Pension Benefits - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jan. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated other comprehensive income (loss), before tax
Net loss		$ 242.2	$ 237.7
Net prior service cost		6.5	7.7
Defined Benefit Plan, Contributions
Plan contributions by employer		88.3	22.5	$ 22.2
Expected benefits payments
2019		32.8
2020		34.0
2021		35.4
2022		37.8
2023		38.4
2024-2028		204.1
United States
Accumulated other comprehensive income (loss), before tax
Net loss		178.8	167.7
Net prior service cost		5.7	7.7
Defined Benefit Plan, Contributions
Plan contributions by employer	$ 81.0	81.7	16.5
Expected benefits payments
2019		25.9
2020		27.0
2021		28.0
2022		29.0
2023		29.8
2024-2028		152.2
Foreign.
Accumulated other comprehensive income (loss), before tax
Net loss		63.4	70.0
Net prior service cost		0.8
Defined Benefit Plan, Contributions
Plan contributions by employer		6.6	6.0
Expected benefits payments
2019		6.9
2020		7.0
2021		7.4
2022		8.8
2023		8.6
2024-2028		51.9
Net liability
Net liability for foreign subsidiaries with benefits under local statutory plans		$ 13.7	$ 16.6