Leasing Future minimum lease payments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Mar. 31, 2019
Future minimum lease payments [Line Items]
Finance Lease, Liability		$ 3.2
Operating Lease, Liability		83.8
Scenario, Forecast [Member]
Future minimum lease payments [Line Items]
Short-term Lease Payments	$ 5.0
Finance Lease [Member]
Future minimum lease payments [Line Items]
Finance Lease, Liability, Payments, Remainder of Fiscal Year		0.8
Finance Lease, Liability, Payments, Due Year Two		1.1
Finance Lease, Liability, Payments, Due Year Three		1.0
Finance Lease, Liability, Payments, Due Year Four		0.8
Finance Lease, Liability, Payments, Due Year Five		0.0
Finance Lease, Liability, Payments, Due after Year Five		0.0
Finance Lease, Liability, Payments, Due		3.7
Finance Lease, Liability, Undiscounted Excess Amount		(0.5)
Finance Lease, Liability		3.2
Operating lease [Member]
Future minimum lease payments [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year		20.1
Lessee, Operating Lease, Liability, Payments, Due Year Two		24.5
Lessee, Operating Lease, Liability, Payments, Due Year Three		16.4
Lessee, Operating Lease, Liability, Payments, Due Year Four		12.8
Lessee, Operating Lease, Liability, Payments, Due Year Five		7.6
Lessee, Operating Lease, Liability, Payments, Due after Year Five		19.0
Lessee, Operating Lease, Liability, Payments, Due		100.4
Lessee, Operating Lease, Liability, Undiscounted Excess Amount		(16.6)
Operating Lease, Liability		$ 83.8

[Line Items] for Future minimum lease payments [Table]

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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease.

+ References

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due after fifth fiscal year following latest fiscal year.

+ References

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in fourth fiscal year following latest fiscal year.

+ References

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in third fiscal year following latest fiscal year.

+ References

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Amount of lessee's undiscounted obligation for lease payments for finance lease, due in second fiscal year following latest fiscal year.

+ References

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- Definition

Amount of lessee's undiscounted obligation for lease payments for finance lease, due in remainder of fiscal year following latest fiscal year ended.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for finance lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fifth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in fourth fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in third fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due in second fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments for operating lease having an initial or remaining lease term in excess of one year due in remainder of fiscal year following latest fiscal year.

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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Amount of cash outflow for short-term lease payment excluded from lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
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-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

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