Restructuring and Repositioning Expenses, Asset Impairments - Narrative (Details) $ in Millions		3 Months Ended		8 Months Ended	13 Months Ended
	Jul. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) segment	Mar. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Feb. 22, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		$ 2.1
Cash payments		$ 1.3
Number of operating segments | segment		2
Restructuring liability		$ 3.3		$ 3.3	$ 3.3	$ 2.7
2019 Plan | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		0.2
Cash payments		0.1
Restructuring liability		0.3		0.3	0.3	0.2
2019 Plan | Other associated costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		0.2
Cash payments		0.0
Restructuring liability		0.2		0.2	0.2	0.0
2019 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated expenses							$ 15.0
2019 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated expenses							20.0
2019 Plan, restructuring activities
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		2.0		2.0	2.0
2019 Plan, restructuring activities | SCC
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		1.6		1.6	1.6
2019 Plan, restructuring activities | SBM
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		0.4		0.4	0.4
2019 Plan, restructuring activities | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		0.9		0.9	0.9
2019 Plan, restructuring activities | Other associated costs
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		0.2		0.2	0.2
2019 Plan, restructuring activities | Asset impairments
Restructuring Cost and Reserve [Line Items]
Estimated expenses							1.0
Costs incurred to date		0.9		0.9	0.9
2019 Plan, restructuring activities | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated expenses							4.0
2019 Plan, restructuring activities | Minimum | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses							2.0
2019 Plan, restructuring activities | Minimum | Other associated costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses							1.0
2019 Plan, restructuring activities | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated expenses							7.0
2019 Plan, restructuring activities | Maximum | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses							3.0
2019 Plan, restructuring activities | Maximum | Other associated costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses							3.0
2019 Plan, repositioning activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		1.4	$ 2.0
Cash payments					9.8
2019 Plan, repositioning activities | Capital expenditures
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		1.2		1.2	1.2
Cash payments		3.6			0.9
2019 Plan, repositioning activities | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated expenses							11.0
2019 Plan, repositioning activities | Minimum | Capital expenditures
Restructuring Cost and Reserve [Line Items]
Estimated expenses							2.0
2019 Plan, repositioning activities | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated expenses							13.0
2019 Plan, repositioning activities | Maximum | Capital expenditures
Restructuring Cost and Reserve [Line Items]
Estimated expenses							$ 3.0
2019 Phase 2 Plan
Restructuring Cost and Reserve [Line Items]
Cash payments		1.6		2.6
2019 Phase 2 Plan | Capital expenditures
Restructuring Cost and Reserve [Line Items]
Cash payments				0.1
2019 Phase 2 Plan | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		1.7
Cash payments		0.6
Decrease in expected charges, due to change in estimate		5.0
Restructuring liability		2.0		2.0	2.0	$ 0.9
2019 Phase 2 Plan | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated expenses	$ 25.0
2019 Phase 2 Plan | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated expenses	30.0
2019 Phase 2 Plan, restructuring activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		4.9
2019 Phase 2 Plan, restructuring activities | SCC
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		2.9
2019 Phase 2 Plan, restructuring activities | SBM
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		2.0
2019 Phase 2 Plan, restructuring activities | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		4.8		4.8	4.8
2019 Phase 2 Plan, restructuring activities | Asset impairments
Restructuring Cost and Reserve [Line Items]
Costs incurred to date		0.1		0.1	0.1
2019 Phase 2 Plan, restructuring activities | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated expenses	$ 18.0
Number of positions eliminated as a percent of total employees	8.00%
2019 Phase 2 Plan, restructuring activities | Minimum | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses	$ 14.0
2019 Phase 2 Plan, restructuring activities | Minimum | Other associated costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses	4.0
2019 Phase 2 Plan, restructuring activities | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated expenses	$ 22.0
Number of positions eliminated as a percent of total employees	10.00%
2019 Phase 2 Plan, restructuring activities | Maximum | Severance and other employee costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses	$ 17.0
2019 Phase 2 Plan, restructuring activities | Maximum | Other associated costs
Restructuring Cost and Reserve [Line Items]
Estimated expenses	5.0
2019 Phase 2 Plan, repositioning activities
Restructuring Cost and Reserve [Line Items]
Restructuring expenses		1.2
2019 Phase 2 Plan, repositioning activities | Capital expenditures
Restructuring Cost and Reserve [Line Items]
Estimated expenses	2.0
Costs incurred to date		$ 0.2		$ 0.2	$ 0.2
2019 Phase 2 Plan, repositioning activities | Minimum
Restructuring Cost and Reserve [Line Items]
Estimated expenses	7.0
2019 Phase 2 Plan, repositioning activities | Maximum
Restructuring Cost and Reserve [Line Items]
Estimated expenses	$ 8.0