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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of future minimum payments under operating leases Future minimum payments under its various non‑cancelable operating leases in future years follows:
(in millions)
 
2018
 
2019
 
2020
 
2021
 
2022
 
Thereafter
Future minimum payments
 
$
22.6

 
$
18.2

 
$
12.1

 
$
8.9

 
$
6.9

 
$
16.2