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Leases (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Leases
Operating lease cost	$ 19.9	$ 20.4	$ 58.8	$ 61.9
Cash payments for operating leases			58.9	61.5
Right-of-use assets obtained in exchange for operating lease obligations			$ 36.6	$ 35.8
Weighted average remaining lease term - operating leases	6 years 1 month 6 days		6 years 1 month 6 days		5 years 8 months 12 days
Weighted average discount rate - operating leases	3.60%		3.60%		3.70%
Maturities of operating lease liabilities
2021 (remaining three months)	$ 14.7		$ 14.7
2022	52.6		52.6
2023	42.9		42.9
2024	34.4		34.4
2025	24.3		24.3
Thereafter	61.1		61.1
Total operating lease payments	230.0		230.0
Less: imputed interest	(29.2)		(29.2)
Total operating lease liabilities	$ 200.8		$ 200.8

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- Definition

Amount of lessee's undiscounted obligation for lease payment for operating lease due year five and 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.

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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 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 having initial or remaining lease term in excess of one year to be paid in remainder of current 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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Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability.

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Weighted average remaining lease term for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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