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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum lease payments under non-cancelable operating leases As of December 31, 2017, our future minimum lease payments under non-cancelable operating leases were as follows (in millions):
Year Ended December 31,
2018
$
39.7

2019
31.0

2020
25.7

2021
21.3

2022
15.1

Thereafter
32.4

 
$
165.2
Schedule of future minimum commitments under agreement with executive officers and key employees As of December 31, 2017, the approximate future minimum commitments under these agreements, excluding discretionary and performance bonuses, are as follows (in millions):
Year Ended December 31,
2018
$
0.9