Leases - Maturity (Details) $ in Millions	Dec. 31, 2020 USD ($)
Undiscounted operating lease liability
Total	$ 121.7
2021	19.6
2022	13.7
2023	10.2
2024	9.5
2025	9.8
Thereafter	$ 58.9
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Reduction due to present value
Total	$ (34.1)
2021	(4.0)
2022	(3.6)
2023	(3.2)
2024	(2.8)
2025	(2.4)
Thereafter	(18.1)
Operating Lease, Liability [Abstract]
Total	87.6
2021	15.6
2022	10.1
2023	7.0
2024	6.7
2025	7.4
Thereafter	$ 40.8

Lessee, Operating Lease, Liability, Undiscounted Excess Amount, After Year Five

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Lessee, Operating Lease, Liability, Undiscounted Excess Amount, Year Five

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Lessee, Operating Lease, Liability, Undiscounted Excess Amount, Year Four

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Lessee, Operating Lease, Liability, Undiscounted Excess Amount, Year One

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Lessee, Operating Lease, Liability, Undiscounted Excess Amount, Year Three

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Lessee, Operating Lease, Liability, Undiscounted Excess Amount, Year Two

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Operating Lease, Liability, After Year Five

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Operating Lease, Liability, Year Five

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Operating Lease, Liability, Year Four

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Operating Lease, Liability, Year One

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Operating Lease, Liability, Year Three

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Operating Lease, Liability, Year Two

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Operating Lease Reduction To Present Value

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Undiscounted Operating Lease Liability

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Amount of lessee's undiscounted obligation for lease payment for operating 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=121609121&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payment for operating lease due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of lessee's undiscounted obligation for lease payment for operating lease to be paid in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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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=121603541&loc=SL77918627-209977

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Indicates line item in statement of financial position that includes operating lease liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918631-209977

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