Fair Value Measurements - Summary of the Company's Carrying and Estimated Fair Value of the Company's Financial Instruments, Carried at Adjusted Historical Cost (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Fair Value [Member] | Level 2
Financial Instrument:
Senior notes	$ 398.4	$ 598.8
Fair Value [Member] | Level 1
Financial Instrument:
Senior notes	487.6	676.4
Fair Value [Member] | Level 3
Financial Instrument:
Finance lease and other obligations	7.3	6.5
Carrying value [Member] | Level 2
Financial Instrument:
Senior notes	541.0	540.5
Carrying value [Member] | Level 1
Financial Instrument:
Senior notes	667.7	668.1
Carrying value [Member] | Level 3
Financial Instrument:
Finance lease and other obligations	7.3	6.5
Revolving Credit Facility | Fair Value [Member] | Level 3
Financial Instrument:
Lines of Credit, Fair Value Disclosure	147.2	0.0
Revolving Credit Facility | Carrying value [Member] | Level 3
Financial Instrument:
Lines of Credit, Fair Value Disclosure	$ 147.2	$ 0.0