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Summary of Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule for Company's allowance for doubtful accounts Changes in the Company's allowance for credit losses by segment follows:
(in millions)CCMCITCFTCorporateTotal
Balance as of December 31, 2018$2.4 $1.0 $0.5 $— $3.9 
Current period provision— 0.8 0.1 0.5 1.4 
Amounts acquired0.1 — 0.5 — 0.6 
Amounts written off(0.3)(0.2)— — (0.5)
Balance as of December 31, 2019$2.2 $1.6 $1.1 $0.5 $5.4 
Current period provision0.8 0.1 0.1 — 1.0 
Amounts written off(0.6)(0.4)(0.4)— (1.4)
Balance as of December 31, 2020$2.4 $1.3 $0.8 $0.5 $5.0