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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Minimum Commitments under Noncancelable Operating Lease Agreements

The minimum commitments under these agreements at December 31, 2017, were as follows:



(millions)	Commitments
2018	$	53.6
2019	44.2
2020	28.5
2021	16.9
2022	8.0
Thereafter	1.1
Total	$	152.3

Expense Incurred for Leases

The expense we incurred for the leases disclosed above, as well as other operating leases that may be cancelable or have terms less than one year, was:



(millions)	Expense
2017	$	77.2
2016	72.9
2015	66.6