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Summary of Significant Accounting Policies - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Cash payments for operating leases included in operating activities		$ 31.8
Cash payments for finance leases included in financing activities		0.9
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 36.2	42.9
Finance leases	$ 0.4	$ 0.4

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Cash Flow, Lessee [Abstract]

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- Definition

Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract]

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- Definition

Amount of cash outflow for principal payment on finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (a)
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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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-Publisher FASB
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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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